Merge tag 'v1.146.0' into pmm-6401-read-prometheus-data-files

Release v1.146.0

.github/workflows/build.yml

@@ -66,6 +66,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Go
         id: go

.github/workflows/changelog-linter.yml

@@ -17,6 +17,7 @@ jobs:
         with:
           # needed for proper diff
           fetch-depth: 0
+          persist-credentials: false
 
       - name: 'Validate that changelog changes are under ## tip'
         run: |

.github/workflows/check-commit-signed.yml

@@ -15,6 +15,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           fetch-depth: 0  # we need full history for commit verification
+          persist-credentials: false
 
       - name: Check commit signatures
         run: |

.github/workflows/check-licenses.yml

@@ -18,6 +18,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Go
         id: go

.github/workflows/codeql-analysis-go.yml

@@ -32,6 +32,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Set up Go
         id: go

.github/workflows/docs.yaml

@@ -21,6 +21,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           path: __vm
+          persist-credentials: false
 
       - name: Checkout private code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
@@ -28,6 +29,7 @@ jobs:
           repository: VictoriaMetrics/vmdocs
           token: ${{ secrets.VM_BOT_GH_TOKEN }}
           path: __vm-docs
+          persist-credentials: true
 
       - name: Import GPG key
         uses: crazy-max/ghaction-import-gpg@2dc316deee8e90f13e1a351ab510b4d5bc0c82cd  # v7.0.0

.github/workflows/test.yml

@@ -35,6 +35,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Go
         id: go
@@ -78,6 +80,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Go
         id: go
@@ -103,6 +107,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Go
         id: go

.github/workflows/vmui.yml

@@ -33,6 +33,8 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Cache node_modules
         id: cache

.golangci.yml

@@ -1,9 +1,18 @@
 version: "2"
 linters:
+  enable:
+    - errorlint
   settings:
     errcheck:
       exclude-functions:
         - (net/http.ResponseWriter).Write
+    errorlint:
+      errorf: true
+      # Do not enable `comparison` and `asserts`: they produce false positives,
+      # since many call sites intentionally compare sentinel errors directly (e.g. err == io.EOF)
+      # when the producer is documented to return them unwrapped. See https://github.com/VictoriaMetrics/VictoriaLogs/pull/1490
+      comparison: false
+      asserts: false
   exclusions:
     generated: lax
     presets:

app/victoria-metrics/main.go

@@ -41,6 +41,12 @@ var (
 		"limit is reached; see also -search.maxQueryDuration")
 )
 
+// custom api help links [["/api","doc"]] without http.pathPrefix.
+var customAPIPathList = [][]string{
+	{"/graph/explore", "explore metrics grafana page"},
+	{"/graph/d/prometheus-advanced/advanced-data-exploration", "PMM grafana dashboard"},
+}
+
 func getDefaultMaxConcurrentRequests() int {
 	// A single request can saturate all the CPU cores, so there is no sense
 	// in allowing higher number of concurrent requests - they will just contend
@@ -148,6 +154,10 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 			{"api/v1/status/active_queries", "active queries"},
 			{"-/reload", "reload configuration"},
 		})
+		for _, p := range customAPIPathList {
+			p, doc := p[0], p[1]
+			fmt.Fprintf(w, "<a href=%q>%s</a> - %s<br/>", p, p, doc)
+		}
 		return true
 	}
 	if vminsert.RequestHandler(w, r) {

app/vmagent/remotewrite/client.go

@@ -187,7 +187,7 @@ func newHTTPClient(argIdx int, remoteWriteURL, sanitizedURL string, fq *persiste
 	return c
 }
 
-func (c *client) init(argIdx, concurrency int, sanitizedURL string) {
+func (c *client) init(argIdx int, sanitizedURL string) {
 	limitReached := metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_rate_limit_reached_total{url=%q}`, c.sanitizedURL))
 	if bytesPerSec := rateLimit.GetOptionalArg(argIdx); bytesPerSec > 0 {
 		logger.Infof("applying %d bytes per second rate limit for -remoteWrite.url=%q", bytesPerSec, sanitizedURL)
@@ -204,11 +204,20 @@ func (c *client) init(argIdx, concurrency int, sanitizedURL string) {
 	c.packetsDropped = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_packets_dropped_total{url=%q}`, c.sanitizedURL))
 	c.retriesCount = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_retries_count_total{url=%q}`, c.sanitizedURL))
 	c.sendDuration = metrics.GetOrCreateFloatCounter(fmt.Sprintf(`vmagent_remotewrite_send_duration_seconds_total{url=%q}`, c.sanitizedURL))
-	metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_queues{url=%q}`, c.sanitizedURL), func() float64 {
-		return float64(concurrency)
-	})
-	for range concurrency {
-		c.wg.Go(c.runWorker)
+	workers := queues.GetOptionalArg(argIdx)
+	if workers <= 0 {
+		workers = 1
+	}
+	inmemoryWorkers := inmemoryQueues.GetOptionalArg(argIdx)
+	for range inmemoryWorkers {
+		c.wg.Go(func() {
+			c.runWorker(c.fq.MustReadInMemoryBlockBlocking)
+		})
+	}
+	for range workers {
+		c.wg.Go(func() {
+			c.runWorker(c.fq.MustReadBlock)
+		})
 	}
 	logger.Infof("initialized client for -remoteWrite.url=%q", c.sanitizedURL)
 }
@@ -302,12 +311,12 @@ func getAWSAPIConfig(argIdx int) (*awsapi.Config, error) {
 	return cfg, nil
 }
 
-func (c *client) runWorker() {
+func (c *client) runWorker(readBlock func(dst []byte) ([]byte, bool)) {
 	var ok bool
 	var block []byte
 	ch := make(chan bool, 1)
 	for {
-		block, ok = c.fq.MustReadBlock(block[:0])
+		block, ok = readBlock(block[:0])
 		if !ok {
 			return
 		}

app/vmagent/remotewrite/pendingseries.go

@@ -209,13 +209,12 @@ func (wr *writeRequest) tryPushMetadata(mms []prompb.MetricMetadata) bool {
 func (wr *writeRequest) copyMetadata(dst, src *prompb.MetricMetadata) {
 	// Direct copy for non-string fields, which are safe by value.
 	dst.Type = src.Type
-	dst.Unit = src.Unit
 
 	dst.AccountID = src.AccountID
 	dst.ProjectID = src.ProjectID
 
 	// Pre-allocate memory for all string fields.
-	neededBufLen := len(src.MetricFamilyName) + len(src.Help)
+	neededBufLen := len(src.MetricFamilyName) + len(src.Help) + len(src.Unit)
 	bufLen := len(wr.metadatabuf)
 	wr.metadatabuf = slicesutil.SetLength(wr.metadatabuf, bufLen+neededBufLen)
 	buf := wr.metadatabuf[:bufLen]
@@ -230,6 +229,11 @@ func (wr *writeRequest) copyMetadata(dst, src *prompb.MetricMetadata) {
 	buf = append(buf, src.Help...)
 	dst.Help = bytesutil.ToUnsafeString(buf[bufLen:])
 
+	// Copy Unit
+	bufLen = len(buf)
+	buf = append(buf, src.Unit...)
+	dst.Unit = bytesutil.ToUnsafeString(buf[bufLen:])
+
 	wr.metadatabuf = buf
 }
 

app/vmagent/remotewrite/remotewrite.go

@@ -66,6 +66,9 @@ var (
 	queues = flagutil.NewArrayInt("remoteWrite.queues", cgroup.AvailableCPUs()*2, "The number of concurrent queues to each -remoteWrite.url. Set more queues if default number of queues "+
 		"isn't enough for sending high volume of collected data to remote storage. "+
 		"Default value depends on the number of available CPU cores. It should work fine in most cases since it minimizes resource usage")
+	inmemoryQueues = flagutil.NewArrayInt("remoteWrite.inmemoryQueues", 0, "The number of additional workers per each -remoteWrite.url, which send only recently ingested data from the in-memory queue, "+
+		"while the file-based queue at -remoteWrite.tmpDataPath is drained by workers configured via -remoteWrite.queues. "+
+		"This reduces delivery lag for fresh samples when the file-based queue contains a backlog accumulated during remote storage outages.")
 	showRemoteWriteURL = flag.Bool("remoteWrite.showURL", false, "Whether to show -remoteWrite.url in the exported metrics. "+
 		"It is hidden by default, since it can contain sensitive info such as auth key")
 	maxPendingBytesPerURL = flagutil.NewArrayBytes("remoteWrite.maxDiskUsagePerURL", 0, "The maximum file-based buffer size in bytes at -remoteWrite.tmpDataPath "+
@@ -906,7 +909,8 @@ func newRemoteWriteCtx(argIdx int, remoteWriteURL *url.URL, sanitizedURL string)
 	}
 
 	isPQDisabled := disableOnDiskQueue.GetOptionalArg(argIdx)
-	queuesSize := queues.GetOptionalArg(argIdx)
+	inmemoryQueueSize := inmemoryQueues.GetOptionalArg(argIdx)
+	queuesSize := queues.GetOptionalArg(argIdx) + inmemoryQueueSize
 	if queuesSize > maxQueues {
 		queuesSize = maxQueues
 	} else if queuesSize <= 0 {
@@ -923,7 +927,13 @@ func newRemoteWriteCtx(argIdx int, remoteWriteURL *url.URL, sanitizedURL string)
 	if maxInmemoryBlocks < 2 {
 		maxInmemoryBlocks = 2
 	}
-	fq := persistentqueue.MustOpenFastQueue(queuePath, sanitizedURL, maxInmemoryBlocks, maxPendingBytes, isPQDisabled)
+	fqOpts := persistentqueue.OpenFastQueueOpts{
+		MaxInmemoryBlocks:      maxInmemoryBlocks,
+		MaxPendingBytes:        maxPendingBytes,
+		IsPQDisabled:           isPQDisabled,
+		PrioritizeInmemoryData: inmemoryQueueSize > 0,
+	}
+	fq := persistentqueue.MustOpenFastQueueWithOpts(queuePath, sanitizedURL, fqOpts)
 	_ = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_pending_data_bytes{path=%q, url=%q}`, queuePath, sanitizedURL), func() float64 {
 		return float64(fq.GetPendingBytes())
 	})
@@ -936,6 +946,9 @@ func newRemoteWriteCtx(argIdx int, remoteWriteURL *url.URL, sanitizedURL string)
 		}
 		return 0
 	})
+	metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_queues{url=%q}`, sanitizedURL), func() float64 {
+		return float64(queuesSize)
+	})
 
 	var c *client
 	switch remoteWriteURL.Scheme {
@@ -944,7 +957,7 @@ func newRemoteWriteCtx(argIdx int, remoteWriteURL *url.URL, sanitizedURL string)
 	default:
 		logger.Fatalf("unsupported scheme: %s for remoteWriteURL: %s, want `http`, `https`", remoteWriteURL.Scheme, sanitizedURL)
 	}
-	c.init(argIdx, queuesSize, sanitizedURL)
+	c.init(argIdx, sanitizedURL)
 
 	// Initialize pss
 	sf := significantFigures.GetOptionalArg(argIdx)

app/vmalert/main.go

@@ -315,6 +315,11 @@ func configReload(ctx context.Context, m *manager, groupsCfg []config.Group, sig
 
 	parseFn := config.Parse
 	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+		}
 		select {
 		case <-ctx.Done():
 			return

app/vmauth/auth_config.go

@@ -840,6 +840,11 @@ func authConfigReloader(sighupCh <-chan os.Signal) {
 	}
 
 	for {
+		select {
+		case <-stopCh:
+			return
+		default:
+		}
 		select {
 		case <-stopCh:
 			return
@@ -906,7 +911,8 @@ func reloadAuthConfigData(data []byte) (bool, error) {
 		return false, fmt.Errorf("failed to parse auth config: %w", err)
 	}
 
-	jui, oidcDP, err := parseJWTUsers(ac)
+	oidcDP := &oidcDiscovererPool{}
+	jui, err := parseJWTUsers(ac, oidcDP)
 	if err != nil {
 		return false, fmt.Errorf("failed to parse JWT users from auth config: %w", err)
 	}

app/vmauth/jwt.go

@@ -72,9 +72,8 @@ type JWTConfig struct {
 	verifierPool atomic.Pointer[jwt.VerifierPool]
 }
 
-func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
+func parseJWTUsers(ac *AuthConfig, oidcDP *oidcDiscovererPool) ([]*UserInfo, error) {
 	jui := make([]*UserInfo, 0, len(ac.Users))
-	oidcDP := &oidcDiscovererPool{}
 
 	uniqClaims := make(map[string]*UserInfo)
 	var sortedClaims []string
@@ -85,10 +84,10 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 		}
 
 		if ui.AuthToken != "" || ui.BearerToken != "" || ui.Username != "" || ui.Password != "" {
-			return nil, nil, fmt.Errorf("auth_token, bearer_token, username and password cannot be specified if jwt is set")
+			return nil, fmt.Errorf("auth_token, bearer_token, username and password cannot be specified if jwt is set")
 		}
 		if len(jwtToken.PublicKeys) == 0 && len(jwtToken.PublicKeyFiles) == 0 && !jwtToken.SkipVerify && jwtToken.OIDC == nil {
-			return nil, nil, fmt.Errorf("jwt must contain at least a single public key, public_key_files, oidc or have skip_verify=true")
+			return nil, fmt.Errorf("jwt must contain at least a single public key, public_key_files, oidc or have skip_verify=true")
 		}
 		var claimsString string
 		sortedClaims = sortedClaims[:0]
@@ -97,7 +96,7 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 			sortedClaims = append(sortedClaims, fmt.Sprintf("%s=%s", ck, cv))
 			pc, err := jwt.NewClaim(ck, cv)
 			if err != nil {
-				return nil, nil, fmt.Errorf("incorrect match claim, key=%q, value regex=%q: %w", ck, cv, err)
+				return nil, fmt.Errorf("incorrect match claim, key=%q, value regex=%q: %w", ck, cv, err)
 			}
 			parsedClaims = append(parsedClaims, pc)
 		}
@@ -106,7 +105,7 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 		claimsString = strings.Join(sortedClaims, ",")
 
 		if oldUI, ok := uniqClaims[claimsString]; ok {
-			return nil, nil, fmt.Errorf("duplicate match claims=%q found for name=%q at idx=%d; the previous one is set for name=%q", claimsString, ui.Name, idx, oldUI.Name)
+			return nil, fmt.Errorf("duplicate match claims=%q found for name=%q at idx=%d; the previous one is set for name=%q", claimsString, ui.Name, idx, oldUI.Name)
 		}
 		uniqClaims[claimsString] = &ui
 		if len(jwtToken.PublicKeys) > 0 || len(jwtToken.PublicKeyFiles) > 0 {
@@ -115,7 +114,7 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 			for i := range jwtToken.PublicKeys {
 				k, err := jwt.ParseKey([]byte(jwtToken.PublicKeys[i]))
 				if err != nil {
-					return nil, nil, err
+					return nil, err
 				}
 				keys = append(keys, k)
 			}
@@ -123,52 +122,52 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 			for _, filePath := range jwtToken.PublicKeyFiles {
 				keyData, err := os.ReadFile(filePath)
 				if err != nil {
-					return nil, nil, fmt.Errorf("cannot read public key from file %q: %w", filePath, err)
+					return nil, fmt.Errorf("cannot read public key from file %q: %w", filePath, err)
 				}
 				k, err := jwt.ParseKey(keyData)
 				if err != nil {
-					return nil, nil, fmt.Errorf("cannot parse public key from file %q: %w", filePath, err)
+					return nil, fmt.Errorf("cannot parse public key from file %q: %w", filePath, err)
 				}
 				keys = append(keys, k)
 			}
 
 			vp, err := jwt.NewVerifierPool(keys)
 			if err != nil {
-				return nil, nil, err
+				return nil, err
 			}
 
 			jwtToken.verifierPool.Store(vp)
 		}
 		if jwtToken.OIDC != nil {
 			if len(jwtToken.PublicKeys) > 0 || len(jwtToken.PublicKeyFiles) > 0 || jwtToken.SkipVerify {
-				return nil, nil, fmt.Errorf("jwt with oidc cannot contain public keys or have skip_verify=true")
+				return nil, fmt.Errorf("jwt with oidc cannot contain public keys or have skip_verify=true")
 			}
 
 			if jwtToken.OIDC.Issuer == "" {
-				return nil, nil, fmt.Errorf("oidc issuer cannot be empty")
+				return nil, fmt.Errorf("oidc issuer cannot be empty")
 			}
 			isserURL, err := url.Parse(jwtToken.OIDC.Issuer)
 			if err != nil {
-				return nil, nil, fmt.Errorf("oidc issuer %q must be a valid URL", jwtToken.OIDC.Issuer)
+				return nil, fmt.Errorf("oidc issuer %q must be a valid URL", jwtToken.OIDC.Issuer)
 			}
 			if isserURL.Scheme != "https" && isserURL.Scheme != "http" {
-				return nil, nil, fmt.Errorf("oidc issuer %q must have http or https scheme", jwtToken.OIDC.Issuer)
+				return nil, fmt.Errorf("oidc issuer %q must have http or https scheme", jwtToken.OIDC.Issuer)
 			}
 
 			oidcDP.createOrAdd(ui.JWT.OIDC.Issuer, &ui.JWT.verifierPool)
 		}
 
 		if err := parseJWTPlaceholdersForUserInfo(&ui, true); err != nil {
-			return nil, nil, err
+			return nil, err
 		}
 
 		if err := ui.initURLs(); err != nil {
-			return nil, nil, err
+			return nil, err
 		}
 
 		metricLabels, err := ui.getMetricLabels()
 		if err != nil {
-			return nil, nil, fmt.Errorf("cannot parse metric_labels: %w", err)
+			return nil, fmt.Errorf("cannot parse metric_labels: %w", err)
 		}
 		ui.requests = ac.ms.GetOrCreateCounter(`vmauth_user_requests_total` + metricLabels)
 		ui.requestErrors = ac.ms.GetOrCreateCounter(`vmauth_user_request_errors_total` + metricLabels)
@@ -187,7 +186,7 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 
 		rt, err := newRoundTripper(ui.TLSCAFile, ui.TLSCertFile, ui.TLSKeyFile, ui.TLSServerName, ui.TLSInsecureSkipVerify)
 		if err != nil {
-			return nil, nil, fmt.Errorf("cannot initialize HTTP RoundTripper: %w", err)
+			return nil, fmt.Errorf("cannot initialize HTTP RoundTripper: %w", err)
 		}
 		ui.rt = rt
 
@@ -200,7 +199,7 @@ func parseJWTUsers(ac *AuthConfig) ([]*UserInfo, *oidcDiscovererPool, error) {
 		return len(jui[i].JWT.MatchClaims) > len(jui[j].JWT.MatchClaims)
 	})
 
-	return jui, oidcDP, nil
+	return jui, nil
 }
 
 var tokenPool sync.Pool

app/vmauth/jwt_test.go

@@ -39,16 +39,14 @@ XOtclIk1uhc03oL9nOQ=
 			}
 			return
 		}
-		users, oidcDP, err := parseJWTUsers(ac)
+		oidcDP := &oidcDiscovererPool{}
+		users, err := parseJWTUsers(ac, oidcDP)
 		if err == nil {
 			t.Fatalf("expecting non-nil error; got %v", users)
 		}
 		if expErr != err.Error() {
 			t.Fatalf("unexpected error; got\n%q\nwant \n%q", err.Error(), expErr)
 		}
-		if oidcDP != nil {
-			t.Fatalf("expecting nil oidcDP; got %v", oidcDP)
-		}
 	}
 
 	// unauthorized_user cannot be used with jwt
@@ -326,7 +324,8 @@ XOtclIk1uhc03oL9nOQ=
 			t.Fatalf("unexpected error: %s", err)
 		}
 
-		jui, oidcDP, err := parseJWTUsers(ac)
+		oidcDP := &oidcDiscovererPool{}
+		jui, err := parseJWTUsers(ac, oidcDP)
 		if err != nil {
 			t.Fatalf("unexpected error: %s", err)
 		}

app/vmctl/auth/auth.go

@@ -131,16 +131,13 @@ func (ac *authContext) initFromBasicAuthConfig(ba *BasicAuthConfig) error {
 	if ba.Username == "" {
 		return fmt.Errorf("missing `username` in `basic_auth` section")
 	}
-	if ba.Password != "" {
-		ac.getAuthHeader = func() string {
-			// See https://en.wikipedia.org/wiki/Basic_access_authentication
-			token := ba.Username + ":" + ba.Password
-			token64 := base64.StdEncoding.EncodeToString([]byte(token))
-			return "Basic " + token64
-		}
-		ac.authDigest = fmt.Sprintf("basic(username=%q, password=%q)", ba.Username, ba.Password)
-		return nil
+	ac.getAuthHeader = func() string {
+		// See https://en.wikipedia.org/wiki/Basic_access_authentication
+		token := ba.Username + ":" + ba.Password
+		token64 := base64.StdEncoding.EncodeToString([]byte(token))
+		return "Basic " + token64
 	}
+	ac.authDigest = fmt.Sprintf("basic(username=%q, password=%q)", ba.Username, ba.Password)
 	return nil
 }
 

app/vmctl/flags.go

@@ -69,6 +69,8 @@ const (
 	vmAddr               = "vm-addr"
 	vmUser               = "vm-user"
 	vmPassword           = "vm-password"
+	vmHeaders            = "vm-headers"
+	vmBearerToken        = "vm-bearer-token"
 	vmAccountID          = "vm-account-id"
 	vmConcurrency        = "vm-concurrency"
 	vmCompress           = "vm-compress"
@@ -112,6 +114,16 @@ var (
 			Usage:   "VictoriaMetrics password for basic auth",
 			EnvVars: []string{"VM_PASSWORD"},
 		},
+		&cli.StringFlag{
+			Name: vmHeaders,
+			Usage: "Optional HTTP headers to send with each request to the corresponding destination address. \n" +
+				"For example, --vm-headers='My-Auth:foobar' would send 'My-Auth: foobar' HTTP header with every request to the corresponding destination address. \n" +
+				"Multiple headers must be delimited by '^^': --vm-headers='header1:value1^^header2:value2'",
+		},
+		&cli.StringFlag{
+			Name:  vmBearerToken,
+			Usage: "Optional bearer auth token to use for the corresponding --vm-addr",
+		},
 		&cli.StringFlag{
 			Name: vmAccountID,
 			Usage: "AccountID is an arbitrary 32-bit integer identifying namespace for data ingestion (aka tenant). \n" +

app/vmctl/influx/influx.go

@@ -259,7 +259,7 @@ func (cr *ChunkedResponse) Next() ([]int64, []float64, error) {
 
 	fieldValues, ok := r.values[cr.field]
 	if !ok {
-		return nil, nil, fmt.Errorf("response doesn't contain filed %q", cr.field)
+		return nil, nil, fmt.Errorf("response doesn't contain field %q", cr.field)
 	}
 	values := make([]float64, len(fieldValues))
 	for i, fv := range fieldValues {

app/vmctl/main.go

@@ -457,7 +457,7 @@ func main() {
 						auth.WithBearer(c.String(vmNativeDstBearerToken)),
 						auth.WithHeaders(c.String(vmNativeDstHeaders)))
 					if err != nil {
-						return fmt.Errorf("error initialize auth config for destination: %s", dstAddr)
+						return fmt.Errorf("error initialize auth config for destination: %s: %w", dstAddr, err)
 					}
 
 					// create TLS config
@@ -563,11 +563,11 @@ func main() {
 	}()
 
 	err = app.Run(os.Args)
+	pushmetrics.StopAndPush()
 	if err != nil {
 		log.Fatalln(err)
 	}
 	log.Printf("Total time: %v", time.Since(start))
-	pushmetrics.StopAndPush()
 }
 
 func initConfigVM(c *cli.Context) (vm.Config, error) {
@@ -596,11 +596,18 @@ func initConfigVM(c *cli.Context) (vm.Config, error) {
 		return vm.Config{}, fmt.Errorf("failed to create backoff object: %w", err)
 	}
 
+	authCfg, err := auth.Generate(
+		auth.WithBasicAuth(c.String(vmUser), c.String(vmPassword)),
+		auth.WithBearer(c.String(vmBearerToken)),
+		auth.WithHeaders(c.String(vmHeaders)))
+	if err != nil {
+		return vm.Config{}, fmt.Errorf("error initialize auth config for destination: %s: %w", addr, err)
+	}
+
 	return vm.Config{
 		Addr:               addr,
 		Transport:          tr,
-		User:               c.String(vmUser),
-		Password:           c.String(vmPassword),
+		AuthCfg:            authCfg,
 		Concurrency:        uint8(c.Int(vmConcurrency)),
 		Compress:           c.Bool(vmCompress),
 		AccountID:          c.String(vmAccountID),

app/vmctl/utils.go

@@ -74,9 +74,9 @@ func wrapErr(vmErr *vm.ImportError, verbose bool) error {
 		verboseMsg = "(enable `--verbose` output to get more details)"
 	}
 	if vmErr.Err == nil {
-		return fmt.Errorf("%s\n\tLatest delivered batch for timestamps range %d - %d %s\n%s",
+		return fmt.Errorf("%w\n\tLatest delivered batch for timestamps range %d - %d %s\n%s",
 			vmErr.Err, minTS, maxTS, verboseMsg, errTS)
 	}
-	return fmt.Errorf("%s\n\tImporting batch failed for timestamps range %d - %d %s\n%s",
+	return fmt.Errorf("%w\n\tImporting batch failed for timestamps range %d - %d %s\n%s",
 		vmErr.Err, minTS, maxTS, verboseMsg, errTS)
 }

app/vmctl/vm/vm.go

@@ -12,6 +12,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/auth"
 	"github.com/VictoriaMetrics/metrics"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/backoff"
@@ -27,6 +28,8 @@ type Config struct {
 	//   --httpListenAddr value for single node version
 	//   --httpListenAddr value of vmselect  component for cluster version
 	Addr string
+
+	AuthCfg *auth.Config
 	// Transport allows specifying custom http.Transport
 	Transport *http.Transport
 	// Concurrency defines number of worker
@@ -40,10 +43,6 @@ type Config struct {
 	// BatchSize defines how many samples
 	// importer collects before sending the import request
 	BatchSize int
-	// User name for basic auth
-	User string
-	// Password for basic auth
-	Password string
 	// SignificantFigures defines the number of significant figures to leave
 	// in metric values before importing.
 	// Zero value saves all the significant decimal places
@@ -65,11 +64,10 @@ type Config struct {
 // see https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#how-to-import-time-series-data
 type Importer struct {
 	addr       string
+	authCfg    *auth.Config
 	client     *http.Client
 	importPath string
 	compress   bool
-	user       string
-	password   string
 
 	close  chan struct{}
 	input  chan *TimeSeries
@@ -148,8 +146,7 @@ func NewImporter(ctx context.Context, cfg Config) (*Importer, error) {
 		client:     client,
 		importPath: importPath,
 		compress:   cfg.Compress,
-		user:       cfg.User,
-		password:   cfg.Password,
+		authCfg:    cfg.AuthCfg,
 		rl:         limiter.NewLimiter(cfg.RateLimit),
 		close:      make(chan struct{}),
 		input:      make(chan *TimeSeries, cfg.Concurrency*4),
@@ -304,8 +301,8 @@ func (im *Importer) Ping() error {
 	if err != nil {
 		return fmt.Errorf("cannot create request to %q: %w", im.addr, err)
 	}
-	if im.user != "" {
-		req.SetBasicAuth(im.user, im.password)
+	if im.authCfg != nil {
+		im.authCfg.SetHeaders(req, true)
 	}
 	resp, err := im.client.Do(req)
 	if err != nil {
@@ -334,8 +331,8 @@ func (im *Importer) Import(tsBatch []*TimeSeries) error {
 		im.importRequestsErrorsTotal.Inc()
 		return fmt.Errorf("cannot create request to %q: %w", im.addr, err)
 	}
-	if im.user != "" {
-		req.SetBasicAuth(im.user, im.password)
+	if im.authCfg != nil {
+		im.authCfg.SetHeaders(req, true)
 	}
 	if im.compress {
 		req.Header.Set("Content-Encoding", "gzip")

app/vmctl/vm_native.go

@@ -405,7 +405,16 @@ func buildMatchWithFilter(filter string, metricName string) (string, error) {
 			if len(tf.Key) == 0 {
 				continue
 			}
-			a = append(a, tf.String())
+			switch {
+			case tf.IsNegative && tf.IsRegexp:
+				a = append(a, fmt.Sprintf("%s!~%q", tf.Key, tf.Value))
+			case tf.IsNegative:
+				a = append(a, fmt.Sprintf("%s!=%q", tf.Key, tf.Value))
+			case tf.IsRegexp:
+				a = append(a, fmt.Sprintf("%s=~%q", tf.Key, tf.Value))
+			default:
+				a = append(a, fmt.Sprintf("%s=%q", tf.Key, tf.Value))
+			}
 		}
 		a = append(a, nameFilter)
 		filters = append(filters, strings.Join(a, ","))

app/vmselect/main.go

@@ -6,8 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"net/http"
-	nethttputil "net/http/httputil"
-	"net/url"
 	"strings"
 	"time"
 
@@ -29,6 +27,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/querytracer"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/vmalertproxy"
 )
 
 var (
@@ -38,7 +37,10 @@ var (
 	resetCacheAuthKey    = flagutil.NewPassword("search.resetCacheAuthKey", "Optional authKey for resetting rollup cache via /internal/resetRollupResultCache call. It could be passed via authKey query arg. It overrides -httpAuth.*")
 	logSlowQueryDuration = flag.Duration("search.logSlowQueryDuration", 5*time.Second, "Log queries with execution time exceeding this value. Zero disables slow query logging. "+
 		"See also -search.logQueryMemoryUsage")
-	vmalertProxyURL = flag.String("vmalert.proxyURL", "", "Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules")
+
+	vmalertProxyURL = flag.String("vmalert.proxyURL", "", "Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , "+
+		"then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules . "+
+		"See https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmalert")
 )
 
 var slowQueries = metrics.NewCounter(`vm_slow_queries_total`)
@@ -55,8 +57,8 @@ func Init(vmselectMaxConcurrentRequests int, vmselectMaxQueueDuration time.Durat
 	concurrencyLimitCh = make(chan struct{}, maxConcurrentRequests)
 
 	initVMUIConfig()
-	initVMAlertProxy()
 
+	vmalertproxy.Init(*vmalertProxyURL)
 	flagutil.RegisterSecretFlag("vmalert.proxyURL")
 }
 
@@ -514,10 +516,11 @@ func handleStaticAndSimpleRequests(w http.ResponseWriter, r *http.Request, path
 		if len(*vmalertProxyURL) == 0 {
 			w.WriteHeader(http.StatusBadRequest)
 			w.Header().Set("Content-Type", "application/json")
-			fmt.Fprintf(w, "%s", `{"status":"error","msg":"for accessing vmalert flag '-vmalert.proxyURL' must be configured"}`)
+			fmt.Fprintf(w, "%s", `{"status":"error","msg":"the '-vmalert.proxyURL' command-line must be configured; `+
+				`see https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmalert"}`)
 			return true
 		}
-		proxyVMAlertRequests(w, r, path)
+		vmalertproxy.HandleRequest(w, r, path)
 		return true
 	}
 
@@ -555,7 +558,7 @@ func handleStaticAndSimpleRequests(w http.ResponseWriter, r *http.Request, path
 	case "/api/v1/rules", "/rules":
 		rulesRequests.Inc()
 		if len(*vmalertProxyURL) > 0 {
-			proxyVMAlertRequests(w, r, path)
+			vmalertproxy.HandleRequest(w, r, path)
 			return true
 		}
 		// Return dumb placeholder for https://prometheus.io/docs/prometheus/latest/querying/api/#rules
@@ -565,7 +568,7 @@ func handleStaticAndSimpleRequests(w http.ResponseWriter, r *http.Request, path
 	case "/api/v1/alerts", "/alerts":
 		alertsRequests.Inc()
 		if len(*vmalertProxyURL) > 0 {
-			proxyVMAlertRequests(w, r, path)
+			vmalertproxy.HandleRequest(w, r, path)
 			return true
 		}
 		// Return dumb placeholder for https://prometheus.io/docs/prometheus/latest/querying/api/#alerts
@@ -575,7 +578,7 @@ func handleStaticAndSimpleRequests(w http.ResponseWriter, r *http.Request, path
 	case "/api/v1/notifiers", "/notifiers":
 		notifiersRequests.Inc()
 		if len(*vmalertProxyURL) > 0 {
-			proxyVMAlertRequests(w, r, path)
+			vmalertproxy.HandleRequest(w, r, path)
 			return true
 		}
 		w.Header().Set("Content-Type", "application/json")
@@ -722,48 +725,7 @@ var (
 	metricNamesStatsResetErrors   = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/admin/status/metric_names_stats/reset"}`)
 )
 
-func proxyVMAlertRequests(w http.ResponseWriter, r *http.Request, path string) {
-	defer func() {
-		err := recover()
-		if err == nil || err == http.ErrAbortHandler {
-			// Suppress http.ErrAbortHandler panic.
-			// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1353
-			return
-		}
-		// Forward other panics to the caller.
-		panic(err)
-	}()
-	req := r.Clone(r.Context())
-	req.URL.Path = strings.TrimPrefix(path, "prometheus")
-	req.Host = vmalertProxyHost
-
-	if strings.HasPrefix(r.Header.Get(`User-Agent`), `Grafana`) {
-		// Grafana currently supports only Prometheus-style alerts. If other alert types
-		// (e.g. logs or traces) are returned, it may fail with "Error loading alerts".
-		//
-		// Grafana queries the vmalert API directly, bypassing the VictoriaMetrics datasource,
-		// so query params (such as datasource_type) cannot be enforced on the Grafana side.
-		//
-		// To ensure compatibility, we detect Grafana requests via the User-Agent and enforce
-		// `datasource_type=prometheus`.
-		//
-		// See:
-		// - https://github.com/VictoriaMetrics/victoriametrics-datasource/issues/329#issuecomment-3847585443
-		// - https://github.com/VictoriaMetrics/victoriametrics-datasource/issues/59
-		q := req.URL.Query()
-		q.Set("datasource_type", "prometheus")
-		req.URL.RawQuery = q.Encode()
-		req.RequestURI = ""
-	}
-
-	vmalertProxy.ServeHTTP(w, req)
-}
-
-var (
-	vmalertProxyHost string
-	vmalertProxy     *nethttputil.ReverseProxy
-	vmuiConfig       string
-)
+var vmuiConfig string
 
 func initVMUIConfig() {
 	var cfg struct {
@@ -795,16 +757,3 @@ func initVMUIConfig() {
 	}
 	vmuiConfig = string(data)
 }
-
-// initVMAlertProxy must be called after flag.Parse(), since it uses command-line flags.
-func initVMAlertProxy() {
-	if len(*vmalertProxyURL) == 0 {
-		return
-	}
-	proxyURL, err := url.Parse(*vmalertProxyURL)
-	if err != nil {
-		logger.Fatalf("cannot parse -vmalert.proxyURL=%q: %s", *vmalertProxyURL, err)
-	}
-	vmalertProxyHost = proxyURL.Host
-	vmalertProxy = nethttputil.NewSingleHostReverseProxy(proxyURL)
-}

app/vmselect/netstorage/netstorage.go

@@ -17,6 +17,7 @@ import (
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/searchutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
+	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage/promdb"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
@@ -320,14 +321,21 @@ func (rss *Results) runParallel(qt *querytracer.Tracer, f func(rs *Result, worke
 }
 
 var (
-	rowsReadPerSeries  = metrics.NewHistogram(`vm_rows_read_per_series`)
-	rowsReadPerQuery   = metrics.NewHistogram(`vm_rows_read_per_query`)
-	seriesReadPerQuery = metrics.NewHistogram(`vm_series_read_per_query`)
+	rowsReadPerSeries            = metrics.NewHistogram(`vm_rows_read_per_series`)
+	rowsReadPerQuery             = metrics.NewHistogram(`vm_rows_read_per_query`)
+	seriesReadPerQuery           = metrics.NewHistogram(`vm_series_read_per_query`)
+	seriesPrometheusReadPerQuery = metrics.NewHistogram(`vm_promdb_series_read_per_query`)
 )
 
 type packedTimeseries struct {
 	metricName string
 	brs        []blockRef
+	pd         *promData
+}
+
+type promData struct {
+	values     []float64
+	timestamps []int64
 }
 
 type unpackWork struct {
@@ -431,9 +439,21 @@ func (pts *packedTimeseries) Unpack(dst *Result, tbf *tmpBlocksFile, tr storage.
 		putSortBlocksHeap(sbh)
 		return err
 	}
-	dedupInterval := storage.GetDedupInterval()
+	if pts.pd != nil {
+		// Add data from Prometheus to dst.
+		// It usually has smaller timestamps than the data from sbs, so put it first.
+		dst.Values = append(dst.Values, pts.pd.values...)
+		dst.Timestamps = append(dst.Timestamps, pts.pd.timestamps...)
+	}
+	dedupInterval := storage.GetDedupInterval(tr.MinTimestamp)
 	mergeSortBlocks(dst, sbh, dedupInterval)
 	putSortBlocksHeap(sbh)
+	if pts.pd != nil {
+		if !sort.IsSorted(dst) {
+			sort.Sort(dst)
+		}
+		pts.pd = nil
+	}
 	return nil
 }
 
@@ -542,6 +562,27 @@ func (pts *packedTimeseries) unpackTo(dst []*sortBlock, tbf *tmpBlocksFile, tr s
 	return dst, firstErr
 }
 
+// sort.Interface implementation for Result
+
+// Len implements sort.Interface
+func (r *Result) Len() int {
+	return len(r.Timestamps)
+}
+
+// Less implements sort.Interface
+func (r *Result) Less(i, j int) bool {
+	timestamps := r.Timestamps
+	return timestamps[i] < timestamps[j]
+}
+
+// Swap implements sort.Interface
+func (r *Result) Swap(i, j int) {
+	timestamps := r.Timestamps
+	values := r.Values
+	timestamps[i], timestamps[j] = timestamps[j], timestamps[i]
+	values[i], values[j] = values[j], values[i]
+}
+
 func getSortBlock() *sortBlock {
 	v := sbPool.Get()
 	if v == nil {
@@ -768,6 +809,15 @@ func LabelNames(qt *querytracer.Tracer, sq *storage.SearchQuery, maxLabelNames i
 	if err != nil {
 		return nil, fmt.Errorf("error during labels search on time range: %w", err)
 	}
+
+	// Merge labels obtained from Prometheus storage.
+	promLabels, err := promdb.GetLabelNamesOnTimeRange(sq.GetTimeRange(), deadline)
+	if err != nil {
+		return nil, fmt.Errorf("cannot obtain labels from Prometheus storage: %w", err)
+	}
+	qt.Printf("get %d label names from Prometheus storage", len(promLabels))
+	labels = mergeStrings(labels, promLabels)
+
 	// Sort labels like Prometheus does
 	sort.Strings(labels)
 	qt.Printf("sort %d labels", len(labels))
@@ -826,14 +876,44 @@ func LabelValues(qt *querytracer.Tracer, labelName string, sq *storage.SearchQue
 	}
 	labelValues, err := vmstorage.VMSelectAPI.LabelValues(qt, sq, labelName, maxLabelValues, deadline.Deadline())
 	if err != nil {
-		return nil, fmt.Errorf("error during label values search on time range for labelName=%q: %w", labelName, err)
+		return nil, fmt.Errorf("error during label values search on time range: %w", err)
 	}
+
+	// Merge label values obtained from Prometheus storage.
+	promLabelValues, err := promdb.GetLabelValuesOnTimeRange(labelName, sq.GetTimeRange(), deadline)
+	if err != nil {
+		return nil, fmt.Errorf("cannot obtain label values on time range for %q from Prometheus storage: %w", labelName, err)
+	}
+	qt.Printf("get %d label values from Prometheus storage", len(promLabelValues))
+	labelValues = mergeStrings(labelValues, promLabelValues)
+
 	// Sort labelValues like Prometheus does
 	sort.Strings(labelValues)
 	qt.Printf("sort %d label values", len(labelValues))
 	return labelValues, nil
 }
 
+func mergeStrings(a, b []string) []string {
+	if len(a) == 0 {
+		return b
+	}
+	if len(b) == 0 {
+		return a
+	}
+	m := make(map[string]struct{}, len(a)+len(b))
+	for _, s := range a {
+		m[s] = struct{}{}
+	}
+	for _, s := range b {
+		m[s] = struct{}{}
+	}
+	result := make([]string, 0, len(m))
+	for s := range m {
+		result = append(result, s)
+	}
+	return result
+}
+
 // GetMetricsMetadata returns time series metric names metadata for the given args
 func GetMetricsMetadata(qt *querytracer.Tracer, limit int, metricName string) ([]*metricsmetadata.Row, error) {
 	qt = qt.NewChild("get metrics metadata: limit=%d, metric_name=%q", limit, metricName)
@@ -1193,6 +1273,26 @@ func ProcessSearchQuery(qt *querytracer.Tracer, sq *storage.SearchQuery, deadlin
 	}
 	qt.Printf("fetch unique series=%d, blocks=%d, samples=%d, bytes=%d", len(m), blocksRead, samples, tbf.Len())
 
+	// Fetch data from promdb.
+	pm := make(map[string]*promData)
+	err = promdb.VisitSeries(sq, deadline, func(metricName []byte, values []float64, timestamps []int64) {
+		pd := pm[string(metricName)]
+		if pd == nil {
+			if _, ok := m[string(metricName)]; !ok {
+				orderedMetricNames = append(orderedMetricNames, string(metricName))
+			}
+			pd = &promData{}
+			pm[string(metricName)] = pd
+		}
+		pd.values = append(pd.values, values...)
+		pd.timestamps = append(pd.timestamps, timestamps...)
+	})
+	if err != nil {
+		putTmpBlocksFile(tbf)
+		vmstorage.PutSearch(sr)
+		return nil, fmt.Errorf("error when searching in Prometheus data: %w", err)
+	}
+	seriesPrometheusReadPerQuery.Update(float64(len(pm)))
 	var rss Results
 	rss.tr = sq.GetTimeRange()
 	rss.deadline = deadline
@@ -1201,6 +1301,7 @@ func ProcessSearchQuery(qt *querytracer.Tracer, sq *storage.SearchQuery, deadlin
 		pts[i] = packedTimeseries{
 			metricName: metricName,
 			brs:        brssPool[m[metricName]].brs,
+			pd:         pm[metricName],
 		}
 	}
 	rss.packedTimeseries = pts

app/vmselect/prometheus/metadata_response.qtpl

@@ -15,7 +15,7 @@ See https://prometheus.io/docs/prometheus/latest/querying/api/#querying-metric-m
 			currentItem := 0
 		 %}
 		{% for _, row := range result %}
-			"{%s string(row.MetricFamilyName) %}": [
+			{%q= string(row.MetricFamilyName) %}: [
 					{
 						"type": {%q= row.Type.String() %},
             {% if len(row.Unit) > 0 -%}

app/vmselect/prometheus/metadata_response.qtpl.go

@@ -35,12 +35,10 @@ func StreamMetadataResponse(qw422016 *qt422016.Writer, result []*metricsmetadata
 
 //line app/vmselect/prometheus/metadata_response.qtpl:17
 	for _, row := range result {
-//line app/vmselect/prometheus/metadata_response.qtpl:17
-		qw422016.N().S(`"`)
 //line app/vmselect/prometheus/metadata_response.qtpl:18
-		qw422016.E().S(string(row.MetricFamilyName))
+		qw422016.N().Q(string(row.MetricFamilyName))
 //line app/vmselect/prometheus/metadata_response.qtpl:18
-		qw422016.N().S(`": [{"type":`)
+		qw422016.N().S(`: [{"type":`)
 //line app/vmselect/prometheus/metadata_response.qtpl:20
 		qw422016.N().Q(row.Type.String())
 //line app/vmselect/prometheus/metadata_response.qtpl:20

app/vmselect/prometheus/prometheus.go

@@ -28,6 +28,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/httputil"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/querytracer"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
@@ -525,6 +526,7 @@ func DeleteHandler(startTime time.Time, r *http.Request) error {
 	if deletedCount > 0 {
 		promql.ResetRollupResultCache()
 	}
+	logger.Infof("/api/v1/admin/tsdb/delete_series has been called for %q. Deleted %d series.", sq.FiltersString(), deletedCount)
 	return nil
 }
 

app/vmselect/vmui/assets/rolldown-runtime-COnpUsM8.js

@@ -1 +0,0 @@
-var e=Object.create,t=Object.defineProperty,n=Object.getOwnPropertyDescriptor,r=Object.getOwnPropertyNames,i=Object.getPrototypeOf,a=Object.prototype.hasOwnProperty,o=(e,t)=>()=>(e&&(t=e(e=0)),t),s=(e,t)=>()=>(t||e((t={exports:{}}).exports,t),t.exports),c=(e,n)=>{let r={};for(var i in e)t(r,i,{get:e[i],enumerable:!0});return n||t(r,Symbol.toStringTag,{value:`Module`}),r},l=(e,i,o,s)=>{if(i&&typeof i==`object`||typeof i==`function`)for(var c=r(i),l=0,u=c.length,d;l<u;l++)d=c[l],!a.call(e,d)&&d!==o&&t(e,d,{get:(e=>i[e]).bind(null,d),enumerable:!(s=n(i,d))||s.enumerable});return e},u=(n,r,a)=>(a=n==null?{}:e(i(n)),l(r||!n||!n.__esModule?t(a,`default`,{value:n,enumerable:!0}):a,n)),d=e=>a.call(e,`module.exports`)?e[`module.exports`]:l(t({},`__esModule`,{value:!0}),e);export{u as a,d as i,o as n,c as r,s as t};

app/vmselect/vmui/assets/rolldown-runtime-Cyuzqnbw.js

@@ -0,0 +1 @@
+var e=Object.create,t=Object.defineProperty,n=Object.getOwnPropertyDescriptor,r=Object.getOwnPropertyNames,i=Object.getPrototypeOf,a=Object.prototype.hasOwnProperty,o=(e,t)=>()=>(e&&(t=e(e=0)),t),s=(e,t)=>()=>(t||(e((t={exports:{}}).exports,t),e=null),t.exports),c=(e,n)=>{let r={};for(var i in e)t(r,i,{get:e[i],enumerable:!0});return n||t(r,Symbol.toStringTag,{value:`Module`}),r},l=(e,i,o,s)=>{if(i&&typeof i==`object`||typeof i==`function`)for(var c=r(i),l=0,u=c.length,d;l<u;l++)d=c[l],!a.call(e,d)&&d!==o&&t(e,d,{get:(e=>i[e]).bind(null,d),enumerable:!(s=n(i,d))||s.enumerable});return e},u=(n,r,a)=>(a=n==null?{}:e(i(n)),l(r||!n||!n.__esModule?t(a,`default`,{value:n,enumerable:!0}):a,n)),d=e=>a.call(e,`module.exports`)?e[`module.exports`]:l(t({},`__esModule`,{value:!0}),e);export{u as a,d as i,o as n,c as r,s as t};

app/vmselect/vmui/index.html

@@ -37,9 +37,9 @@
   <meta property="og:title" content="UI for VictoriaMetrics">
   <meta property="og:url" content="https://victoriametrics.com/">
   <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
-  <script type="module" crossorigin src="./assets/index-CoGukb-x.js"></script>
-  <link rel="modulepreload" crossorigin href="./assets/rolldown-runtime-COnpUsM8.js">
-  <link rel="modulepreload" crossorigin href="./assets/vendor-C8Kwp93_.js">
+  <script type="module" crossorigin src="./assets/index-CusQvJzs.js"></script>
+  <link rel="modulepreload" crossorigin href="./assets/rolldown-runtime-Cyuzqnbw.js">
+  <link rel="modulepreload" crossorigin href="./assets/vendor-B83wxFqK.js">
   <link rel="stylesheet" crossorigin href="./assets/vendor-CnsZ1jie.css">
   <link rel="stylesheet" crossorigin href="./assets/index-BBUnmLOr.css">
 </head>

app/vmstorage/main.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage/promdb"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
@@ -101,6 +102,9 @@ var (
 
 	metadataStorageSize = flagutil.NewBytes("storage.maxMetadataStorageSize", 0, "Overrides max size for metrics metadata entries in-memory storage. "+
 		"If set to 0 or a negative value, defaults to 1% of allowed memory.")
+
+	downsamplingPeriods = flagutil.NewArrayString("downsampling.period", "Comma-separated downsampling periods in the format 'offset:period'. For example, '30d:10m' instructs "+
+		"to leave a single sample per 10 minutes for samples older than 30 days. See https://docs.victoriametrics.com/#downsampling for details")
 )
 
 func DataPath() string {
@@ -109,7 +113,12 @@ func DataPath() string {
 
 // Init initializes vmstorage.
 func Init(vmselectMaxConcurrentRequests int, resetCacheIfNeeded func(mrs []storage.MetricRow)) {
-	storage.SetDedupInterval(*minScrapeInterval)
+
+	err := storage.SetDownsamplingPeriods(*downsamplingPeriods, *minScrapeInterval)
+	if err != nil {
+		logger.Fatalf("cannot parse -downsampling.period: %s", err)
+	}
+
 	storage.SetDataFlushInterval(*inmemoryDataFlushInterval)
 	storage.LegacySetRetentionTimezoneOffset(*retentionTimezoneOffset)
 	storage.SetFreeDiskSpaceLimit(minFreeDiskSpaceBytes.N)
@@ -164,6 +173,8 @@ func Init(vmselectMaxConcurrentRequests int, resetCacheIfNeeded func(mrs []stora
 	logger.Infof("successfully opened storage %q in %.3f seconds; partsCount: %d; blocksCount: %d; rowsCount: %d; sizeBytes: %d",
 		*storageDataPath, time.Since(startTime).Seconds(), partsCount, blocksCount, rowsCount, sizeBytes)
 
+	promdb.Init(retentionPeriod.Milliseconds())
+
 	// register storage metrics
 	storageMetrics = metrics.NewSet()
 	storageMetrics.RegisterMetricsWriter(vmStorage.writeStorageMetrics)
@@ -201,6 +212,7 @@ func Stop() {
 
 	logger.Infof("gracefully closing the storage at %s", *storageDataPath)
 	startTime := time.Now()
+	promdb.MustClose()
 	vmStorage.Stop()
 	logger.Infof("successfully closed the storage in %.3f seconds", time.Since(startTime).Seconds())
 

app/vmstorage/promdb/promdb.go

@@ -0,0 +1,268 @@
+package promdb
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/oklog/ulid/v2"
+	"github.com/prometheus/prometheus/model/labels"
+	promstorage "github.com/prometheus/prometheus/storage"
+	"github.com/prometheus/prometheus/tsdb"
+	"github.com/prometheus/prometheus/tsdb/chunkenc"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/searchutil"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
+)
+
+var prometheusDataPath = flag.String("prometheusDataPath", "", "Optional path to readonly historical Prometheus data")
+
+var prometheusRetentionMsecs int64
+
+// Init must be called after flag.Parse and before using the package.
+//
+// See also MustClose.
+func Init(retentionMsecs int64) {
+	if promDB != nil {
+		logger.Fatalf("BUG: promdb.Init is called multiple times without promdb.MustClose call")
+	}
+	prometheusRetentionMsecs = retentionMsecs
+	if *prometheusDataPath == "" {
+		return
+	}
+	l := slog.New(slog.Default().Handler())
+	opts := tsdb.DefaultOptions()
+	opts.RetentionDuration = retentionMsecs
+
+	// Set max block duration to 10% of retention period or 31 days
+	// according to https://prometheus.io/docs/prometheus/latest/storage/#compaction
+	maxBlockDuration := int64((31 * 24 * time.Hour) / time.Millisecond)
+	if maxBlockDuration > retentionMsecs/10 {
+		maxBlockDuration = retentionMsecs / 10
+	}
+	if maxBlockDuration < opts.MinBlockDuration {
+		maxBlockDuration = opts.MinBlockDuration
+	}
+	opts.MaxBlockDuration = maxBlockDuration
+
+	// Custom delete function is needed, because Prometheus by default doesn't delete
+	// blocks outside the retention if no new blocks are created with samples with the current timestamps.
+	// See https://github.com/prometheus/prometheus/blob/997bb7134fcfd7279f250e183e78681e48a56aff/tsdb/db.go#L1116
+	opts.BlocksToDelete = func(blocks []*tsdb.Block) map[ulid.ULID]struct{} {
+		m := make(map[ulid.ULID]struct{})
+		minRetentionTime := time.Now().Unix()*1000 - retentionMsecs
+		for _, block := range blocks {
+			meta := block.Meta()
+			// delete block marked for deletion by compaction code.
+			if meta.Compaction.Deletable {
+				m[meta.ULID] = struct{}{}
+				continue
+			}
+			if block.MaxTime() < minRetentionTime {
+				m[meta.ULID] = struct{}{}
+			}
+		}
+		return m
+	}
+	pdb, err := tsdb.Open(*prometheusDataPath, l, nil, opts, nil)
+	if err != nil {
+		logger.Panicf("FATAL: cannot open Prometheus data at -prometheusDataPath=%q: %s", *prometheusDataPath, err)
+	}
+	promDB = pdb
+	logger.Infof("successfully opened historical Prometheus data at -prometheusDataPath=%q with retentionMsecs=%d", *prometheusDataPath, retentionMsecs)
+}
+
+// MustClose must be called on graceful shutdown.
+//
+// Package functionality cannot be used after this call.
+func MustClose() {
+	if *prometheusDataPath == "" {
+		return
+	}
+	if promDB == nil {
+		logger.Panicf("BUG: promdb.MustClose is called without promdb.Init call")
+	}
+	if err := promDB.Close(); err != nil {
+		logger.Panicf("FATAL: cannot close promDB: %s", err)
+	}
+	promDB = nil
+	logger.Infof("successfully closed historical Prometheus data at -prometheusDataPath=%q", *prometheusDataPath)
+}
+
+var promDB *tsdb.DB
+
+// GetLabelNamesOnTimeRange returns label names.
+func GetLabelNamesOnTimeRange(tr storage.TimeRange, deadline searchutil.Deadline) ([]string, error) {
+	if *prometheusDataPath == "" {
+		return nil, nil
+	}
+	d := time.Unix(int64(deadline.Deadline()), 0)
+	ctx, cancel := context.WithDeadline(context.Background(), d)
+	defer cancel()
+	q, err := promDB.Querier(tr.MinTimestamp, tr.MaxTimestamp)
+	if err != nil {
+		return nil, err
+	}
+	defer mustCloseQuerier(q)
+
+	names, _, err := q.LabelNames(ctx, nil)
+	// Make full copy of names, since they cannot be used after q is closed.
+	names = copyStringsWithMemory(names)
+	return names, err
+}
+
+// GetLabelValuesOnTimeRange returns values for the given labelName on the given tr.
+func GetLabelValuesOnTimeRange(labelName string, tr storage.TimeRange, deadline searchutil.Deadline) ([]string, error) {
+	if *prometheusDataPath == "" {
+		return nil, nil
+	}
+	d := time.Unix(int64(deadline.Deadline()), 0)
+	ctx, cancel := context.WithDeadline(context.Background(), d)
+	defer cancel()
+	q, err := promDB.Querier(tr.MinTimestamp, tr.MaxTimestamp)
+	if err != nil {
+		return nil, err
+	}
+	defer mustCloseQuerier(q)
+
+	values, _, err := q.LabelValues(ctx, labelName, nil)
+	// Make full copy of values, since they cannot be used after q is closed.
+	values = copyStringsWithMemory(values)
+	return values, err
+}
+
+func copyStringsWithMemory(a []string) []string {
+	result := make([]string, len(a))
+	for i, s := range a {
+		result[i] = string(append([]byte{}, s...))
+	}
+	return result
+}
+
+// SeriesVisitor is called by VisitSeries for each matching time series.
+//
+// The caller shouldn't hold references to metricName, values and timestamps after returning.
+type SeriesVisitor func(metricName []byte, values []float64, timestamps []int64)
+
+// VisitSeries calls f for each series found in the pdb.
+func VisitSeries(sq *storage.SearchQuery, deadline searchutil.Deadline, f SeriesVisitor) error {
+	if *prometheusDataPath == "" {
+		return nil
+	}
+	d := time.Unix(int64(deadline.Deadline()), 0)
+	ctx, cancel := context.WithDeadline(context.Background(), d)
+	defer cancel()
+	minTime, maxTime := getSearchTimeRange(sq)
+	q, err := promDB.Querier(minTime, maxTime)
+	if err != nil {
+		return err
+	}
+	defer mustCloseQuerier(q)
+	var seriesSet []promstorage.SeriesSet
+	for _, tf := range sq.TagFilterss {
+		ms, err := convertTagFiltersToMatchers(tf)
+		if err != nil {
+			return fmt.Errorf("cannot convert tag filters to matchers: %w", err)
+		}
+		s := q.Select(ctx, false, nil, ms...)
+		seriesSet = append(seriesSet, s)
+	}
+	ss := promstorage.NewMergeSeriesSet(seriesSet, 0, promstorage.ChainedSeriesMerge)
+	var (
+		mn         storage.MetricName
+		metricName []byte
+		values     []float64
+		timestamps []int64
+	)
+	var it chunkenc.Iterator
+	for ss.Next() {
+		s := ss.At()
+		convertPromLabelsToMetricName(&mn, s.Labels())
+		metricName = mn.SortAndMarshal(metricName[:0])
+		values = values[:0]
+		timestamps = timestamps[:0]
+		it = s.Iterator(it)
+		for {
+			typ := it.Next()
+			if typ == chunkenc.ValNone {
+				break
+			}
+			if typ != chunkenc.ValFloat {
+				// Skip unsupported values
+				continue
+			}
+			ts, v := it.At()
+			values = append(values, v)
+			timestamps = append(timestamps, ts)
+		}
+		if err := it.Err(); err != nil {
+			return fmt.Errorf("error when iterating Prometheus series: %w", err)
+		}
+		f(metricName, values, timestamps)
+	}
+	return ss.Err()
+}
+
+func getSearchTimeRange(sq *storage.SearchQuery) (int64, int64) {
+	maxTime := sq.MaxTimestamp
+	minTime := sq.MinTimestamp
+	minRetentionTime := time.Now().Unix()*1000 - prometheusRetentionMsecs
+	if maxTime < minRetentionTime {
+		maxTime = minRetentionTime
+	}
+	if minTime < minRetentionTime {
+		minTime = minRetentionTime
+	}
+	return minTime, maxTime
+}
+
+func convertPromLabelsToMetricName(dst *storage.MetricName, ls labels.Labels) {
+	dst.Reset()
+	ls.Range(func(label labels.Label) {
+		if label.Name == "__name__" {
+			dst.MetricGroup = append(dst.MetricGroup[:0], label.Value...)
+		} else {
+			dst.AddTag(label.Name, label.Value)
+		}
+	})
+}
+
+func convertTagFiltersToMatchers(tfs []storage.TagFilter) ([]*labels.Matcher, error) {
+	ms := make([]*labels.Matcher, 0, len(tfs))
+	for _, tf := range tfs {
+		var mt labels.MatchType
+		if tf.IsNegative {
+			if tf.IsRegexp {
+				mt = labels.MatchNotRegexp
+			} else {
+				mt = labels.MatchNotEqual
+			}
+		} else {
+			if tf.IsRegexp {
+				mt = labels.MatchRegexp
+			} else {
+				mt = labels.MatchEqual
+			}
+		}
+		key := string(tf.Key)
+		if key == "" {
+			key = "__name__"
+		}
+		value := string(tf.Value)
+		m, err := labels.NewMatcher(mt, key, value)
+		if err != nil {
+			return nil, err
+		}
+		ms = append(ms, m)
+	}
+	return ms, nil
+}
+
+func mustCloseQuerier(q promstorage.Querier) {
+	if err := q.Close(); err != nil {
+		logger.Panicf("FATAL: cannot close querier: %s", err)
+	}
+}

app/vmui/packages/vmui/src/components/Chart/ChartTooltip/ChartTooltip.tsx

@@ -5,7 +5,7 @@ import uPlot from "uplot";
 import Button from "../../Main/Button/Button";
 import { CloseIcon, DragIcon } from "../../Main/Icons";
 import { SeriesItemStatsFormatted } from "../../../types";
-import { STATS_ORDER } from "../../../constants/graph";
+import { STATS_ORDER_TOOLTIP } from "../../../constants/graph";
 
 export interface ChartTooltipProps {
   u?: uPlot;
@@ -164,7 +164,7 @@ const ChartTooltip: FC<ChartTooltipProps> = ({
       </div>
       {statsFormatted && (
         <table className="vm-chart-tooltip-stats">
-          {STATS_ORDER.map((key, i) => (
+          {STATS_ORDER_TOOLTIP.map((key, i) => (
             <div
               className="vm-chart-tooltip-stats-row"
               key={i}

app/vmui/packages/vmui/src/components/Chart/Line/Legend/LegendConfigs/LegendConfigs.tsx

@@ -61,7 +61,7 @@ const LegendConfigs: FC<Props> = ({ data, isCompact }) => {
       label: "Hide Statistics",
       value: hideStats,
       onChange: onChangeStats,
-      info: "If enabled, hides the display of min, median, and max values.",
+      info: "If enabled, hides the display of min, median, max, and last values.",
     }
   ];
 

app/vmui/packages/vmui/src/components/Chart/Line/Legend/LegendItem/LegendItem.tsx

@@ -5,7 +5,7 @@ import "./style.scss";
 import classNames from "classnames";
 import { getFreeFields } from "./helpers";
 import useCopyToClipboard from "../../../../../hooks/useCopyToClipboard";
-import { STATS_ORDER } from "../../../../../constants/graph";
+import { STATS_ORDER_LEGEND } from "../../../../../constants/graph";
 import { useShowStats } from "../hooks/useShowStats";
 import { useLegendFormat } from "../hooks/useLegendFormat";
 import { getLabelAlias } from "../../../../../utils/metric";
@@ -80,7 +80,7 @@ const LegendItem: FC<LegendItemProps> = ({ legend, onChange, duplicateFields })
       </div>
       {!hideStats && showStats && (
         <div className="vm-legend-item-stats">
-          {STATS_ORDER.map((key, i) => (
+          {STATS_ORDER_LEGEND.map((key, i) => (
             <div
               className="vm-legend-item-stats-row"
               key={i}

app/vmui/packages/vmui/src/components/Chart/Line/Legend/LegendViews/LegendTable.tsx

@@ -4,11 +4,11 @@ import "./style.scss";
 import { LegendItemType } from "../../../../../types";
 import { MouseEvent } from "react";
 import classNames from "classnames";
-import { STATS_ORDER } from "../../../../../constants/graph";
+import { STATS_ORDER_LEGEND } from "../../../../../constants/graph";
 import { useShowStats } from "../hooks/useShowStats";
 import { getValueByPath } from "../../../../../utils/object";
 
-const statsColumns = STATS_ORDER.map(k => ({
+const statsColumns = STATS_ORDER_LEGEND.map(k => ({
   key: `statsFormatted.${k}`,
   title: k
 }));

app/vmui/packages/vmui/src/constants/graph.ts

@@ -26,4 +26,5 @@ export const GRAPH_SIZES: GraphSize[] = [
   },
 ];
 
-export const STATS_ORDER: (keyof SeriesItemStatsFormatted)[] = ["min", "median", "max"];
+export const STATS_ORDER_LEGEND: (keyof SeriesItemStatsFormatted)[] = ["min", "median", "max", "last"];
+export const STATS_ORDER_TOOLTIP: (keyof SeriesItemStatsFormatted)[] = ["min", "median", "max"];

app/vmui/packages/vmui/src/types/uplot.ts

@@ -4,6 +4,7 @@ export interface SeriesItemStatsFormatted {
     min: string,
     max: string,
     median: string,
+    last: string,
 }
 
 export interface SeriesItem extends Series {

app/vmui/packages/vmui/src/utils/uplot/series.ts

@@ -53,6 +53,7 @@ const getSeriesStatistics = (d: MetricResult) => {
       min: formatPrettyNumber(min, min, max),
       max: formatPrettyNumber(max, min, max),
       median: formatPrettyNumber(median, min, max),
+      last: formatPrettyNumber(values.at(-1), min, max),
     },
   };
 };

apptest/tests/metricsmetadata_test.go

@@ -45,11 +45,13 @@ func TestSingleMetricsMetadata(t *testing.T) {
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_4"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_5"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_6"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
+			{Labels: []prompb.Label{{Name: "__name__", Value: `metric_name_7_!@"_suffix`}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 		},
 		Metadata: []prompb.MetricMetadata{
 			{MetricFamilyName: "metric_name_4", Help: "some help message", Type: prompb.MetricTypeSummary},
 			{MetricFamilyName: "metric_name_5", Help: "some help message", Type: prompb.MetricTypeSummary},
 			{MetricFamilyName: "metric_name_6", Help: "some help message", Type: prompb.MetricTypeStateset},
+			{MetricFamilyName: `metric_name_7_!@"_suffix`, Help: "some help message", Type: prompb.MetricTypeStateset},
 		},
 	}
 
@@ -59,12 +61,13 @@ func TestSingleMetricsMetadata(t *testing.T) {
 	expected := &apptest.PrometheusAPIV1Metadata{
 		Status: "success",
 		Data: map[string][]apptest.MetadataEntry{
-			"metric_name_1": {{Help: "some help message", Type: "gauge"}},
-			"metric_name_2": {{Help: "some help message", Type: "counter"}},
-			"metric_name_3": {{Help: "some help message", Type: "gauge"}},
-			"metric_name_4": {{Help: "some help message", Type: "summary"}},
-			"metric_name_5": {{Help: "some help message", Type: "summary"}},
-			"metric_name_6": {{Help: "some help message", Type: "stateset"}},
+			"metric_name_1":            {{Help: "some help message", Type: "gauge"}},
+			"metric_name_2":            {{Help: "some help message", Type: "counter"}},
+			"metric_name_3":            {{Help: "some help message", Type: "gauge"}},
+			"metric_name_4":            {{Help: "some help message", Type: "summary"}},
+			"metric_name_5":            {{Help: "some help message", Type: "summary"}},
+			"metric_name_6":            {{Help: "some help message", Type: "stateset"}},
+			`metric_name_7_!@"_suffix`: {{Help: "some help message", Type: "stateset"}},
 		},
 	}
 	gotStats := sut.PrometheusAPIV1Metadata(t, "", 0, apptest.QueryOpts{})
@@ -154,11 +157,13 @@ func TestClusterMetricsMetadata(t *testing.T) {
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_4"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_5"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 			{Labels: []prompb.Label{{Name: "__name__", Value: "metric_name_6"}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
+			{Labels: []prompb.Label{{Name: "__name__", Value: `metric_name_7_!@"_suffix`}}, Samples: []prompb.Sample{{Value: 40, Timestamp: ingestTimestamp}}},
 		},
 		Metadata: []prompb.MetricMetadata{
 			{MetricFamilyName: "metric_name_4", Help: "some help message", Type: prompb.MetricTypeSummary},
 			{MetricFamilyName: "metric_name_5", Help: "some help message", Type: prompb.MetricTypeSummary},
 			{MetricFamilyName: "metric_name_6", Help: "some help message", Type: prompb.MetricTypeStateset},
+			{MetricFamilyName: `metric_name_7_!@"_suffix`, Help: "some help message", Type: prompb.MetricTypeStateset},
 		},
 	}
 
@@ -171,12 +176,13 @@ func TestClusterMetricsMetadata(t *testing.T) {
 		expected := &apptest.PrometheusAPIV1Metadata{
 			Status: "success",
 			Data: map[string][]apptest.MetadataEntry{
-				"metric_name_1": {{Help: "some help message", Type: "gauge"}},
-				"metric_name_2": {{Help: "some help message", Type: "counter"}},
-				"metric_name_3": {{Help: "some help message", Type: "gauge"}},
-				"metric_name_4": {{Help: "some help message", Type: "summary"}},
-				"metric_name_5": {{Help: "some help message", Type: "summary"}},
-				"metric_name_6": {{Help: "some help message", Type: "stateset"}},
+				"metric_name_1":            {{Help: "some help message", Type: "gauge"}},
+				"metric_name_2":            {{Help: "some help message", Type: "counter"}},
+				"metric_name_3":            {{Help: "some help message", Type: "gauge"}},
+				"metric_name_4":            {{Help: "some help message", Type: "summary"}},
+				"metric_name_5":            {{Help: "some help message", Type: "summary"}},
+				"metric_name_6":            {{Help: "some help message", Type: "stateset"}},
+				`metric_name_7_!@"_suffix`: {{Help: "some help message", Type: "stateset"}},
 			},
 		}
 		gotStats := vmselect.PrometheusAPIV1Metadata(t, "", 0, apptest.QueryOpts{Tenant: tenantID})

apptest/tests/vmagent_remotewrite_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http/httptest"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -332,13 +333,11 @@ func TestSingleVMAgentDropOnOverload(t *testing.T) {
 	vmagent.APIV1ImportPrometheusNoWaitFlush(t, []string{
 		"foo_bar 1 1652169600000", // 2022-05-10T08:00:00Z
 	}, apptest.QueryOpts{})
-
 	waitFor(
 		func() bool {
 			return vmagent.RemoteWriteRequests(t, url1) == 1 && vmagent.RemoteWriteRequests(t, url2) == 1
 		},
 	)
-
 	// Send 2 more requests, the first RW endpoint should receive everything, the second should add them to the queue
 	// since worker is busy with the first request.
 	for i := range 2 {
@@ -641,3 +640,116 @@ func TestSingleVMAgentMultitenancy(t *testing.T) {
 		t.Fatalf("expected vmagent_tenant_inserted_rows_total to have value 1 for accountID=5, projectID=0")
 	}
 }
+
+func TestSingleVMAgentPriorizeRecentData(t *testing.T) {
+	tc := apptest.NewTestCase(t)
+	defer tc.Stop()
+
+	remoteWriteSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer remoteWriteSrv.Close()
+
+	var mustRW2ReturnError atomic.Bool
+	mustRW2ReturnError.Store(true)
+
+	remoteWriteSrv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if mustRW2ReturnError.Load() {
+			w.WriteHeader(http.StatusServiceUnavailable)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer remoteWriteSrv2.Close()
+
+	vmagent := tc.MustStartDefaultRWVmagent("vmagent", []string{
+		fmt.Sprintf(`-remoteWrite.url=%s/api/v1/write`, remoteWriteSrv.URL),
+		fmt.Sprintf(`-remoteWrite.url=%s/api/v1/write`, remoteWriteSrv2.URL),
+		"-remoteWrite.disableOnDiskQueue=true",
+		// use only 1 worker to get a full queue faster
+		"-remoteWrite.queues=1",
+		"-remoteWrite.flushInterval=1ms",
+		"-remoteWrite.inmemoryQueues=1",
+		// fastqueue size is roughly memory.Allowed() / len(urls) / *maxRowsPerBlock / 100
+		// Use very large maxRowsPerBlock to get fastqueue of minimal length(2).
+		// See initRemoteWriteCtxs function in remotewrite.go for details.
+		"-remoteWrite.maxRowsPerBlock=1000000000",
+		"-remoteWrite.tmpDataPath=" + tc.Dir() + "/vmagent",
+
+		// Delay retry logic to avoid race conditions with waitFor assertions.
+		// It improves the test stability on resource-constrained runners.
+		"-remoteWrite.retryMinInterval=3s",
+		"-remoteWrite.retryMaxTime=3s",
+	})
+
+	const (
+		retries = 20
+		period  = 200 * time.Millisecond
+	)
+
+	waitFor := func(f func() bool) {
+		t.Helper()
+		for range retries {
+			if f() {
+				return
+			}
+			time.Sleep(period)
+		}
+		t.Fatalf("timed out waiting for retry #%d", retries)
+	}
+
+	// Real remote write URLs are hidden in metrics
+	url1 := "1:secret-url"
+	url2 := "2:secret-url"
+
+	// Wait until first request got flushed to remote write server
+	vmagent.APIV1ImportPrometheusNoWaitFlush(t, []string{
+		"foo_bar 1 1652169600000", // 2022-05-10T08:00:00Z
+	}, apptest.QueryOpts{})
+	waitFor(
+		func() bool {
+			return vmagent.RemoteWriteRequests(t, url1) == 1 && vmagent.RemoteWriteRequests(t, url2) == 1
+		},
+	)
+	// Wait until second request got flushed to remote write server
+	// since there are 2 independent queues (general and in-memory) with minimal capacity of 1
+	vmagent.APIV1ImportPrometheusNoWaitFlush(t, []string{
+		"foo_bar 1 1652169600000", // 2022-05-10T08:00:00Z
+	}, apptest.QueryOpts{})
+	waitFor(
+		func() bool {
+			return vmagent.RemoteWriteRequests(t, url1) == 2 && vmagent.RemoteWriteRequests(t, url2) == 2
+		},
+	)
+	// Send 2 more requests, the first RW endpoint should receive everything, the second should add them to the queue
+	// since worker is busy with the first request.
+	for i := range 2 {
+		vmagent.APIV1ImportPrometheusNoWaitFlush(t, []string{
+			"foo_bar 1 1652169600000", // 2022-05-10T08:00:00Z
+		}, apptest.QueryOpts{})
+
+		waitFor(
+			func() bool {
+				return vmagent.RemoteWriteRequests(t, url1) == 3+i && vmagent.RemoteWritePendingInmemoryBlocks(t, url2) == 1+i
+			},
+		)
+	}
+
+	// Send one more request.
+	vmagent.APIV1ImportPrometheusNoWaitFlush(t, []string{
+		"foo_bar 1 1652169600000", // 2022-05-10T08:00:00Z
+	}, apptest.QueryOpts{})
+
+	waitFor(
+		func() bool {
+			return vmagent.RemoteWriteRequests(t, url1) == 5 && vmagent.RemoteWriteSamplesDropped(t, url2) > 0
+		},
+	)
+	mustRW2ReturnError.Store(false)
+	// ensure that inmemory data correctly flushed to the remote write
+	waitFor(
+		func() bool {
+			return vmagent.RemoteWritePendingInmemoryBlocks(t, url2) == 0
+		},
+	)
+}

dashboards/vm/vmagent.json

@@ -6201,7 +6201,7 @@
             "type": "victoriametrics-metrics-datasource",
             "uid": "$ds"
           },
-          "description": "The rate of ignored samples during aggregation. \nStream aggregation will drop samples with NaN values, or samples with too old timestamps. See https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#ignoring-old-samples ",
+          "description": "The rate of dropped samples during aggregation. \nStream aggregation will drop samples with NaN values, too old timestamps or samples identified as duplicates during deduplication. See https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#ignoring-old-samples ",
           "fieldConfig": {
             "defaults": {
               "color": {
@@ -6282,14 +6282,14 @@
                 "uid": "$ds"
               },
               "editorMode": "code",
-              "expr": "sum(rate(vm_streamaggr_ignored_samples_total{job=~\"$job\",instance=~\"$instance\", url=~\"$url\"}[$__rate_interval]) > 0) without (instance, pod)",
+              "expr": "sum(rate({__name__=~\"vm_streamaggr_ignored_samples_total|vm_streamaggr_dedup_dropped_samples_total\", job=~\"$job\",instance=~\"$instance\", url=~\"$url\"}[$__rate_interval]) > 0) without (instance, pod)",
               "instant": false,
               "legendFormat": "__auto",
               "range": true,
               "refId": "A"
             }
           ],
-          "title": "Ignored samples ($instance)",
+          "title": "Dropped samples ($instance)",
           "type": "timeseries"
         },
         {

dashboards/vmagent.json

@@ -6200,7 +6200,7 @@
             "type": "prometheus",
             "uid": "$ds"
           },
-          "description": "The rate of ignored samples during aggregation. \nStream aggregation will drop samples with NaN values, or samples with too old timestamps. See https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#ignoring-old-samples ",
+          "description": "The rate of dropped samples during aggregation. \nStream aggregation will drop samples with NaN values, too old timestamps or samples identified as duplicates during deduplication. See https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#ignoring-old-samples ",
           "fieldConfig": {
             "defaults": {
               "color": {
@@ -6281,14 +6281,14 @@
                 "uid": "$ds"
               },
               "editorMode": "code",
-              "expr": "sum(rate(vm_streamaggr_ignored_samples_total{job=~\"$job\",instance=~\"$instance\", url=~\"$url\"}[$__rate_interval]) > 0) without (instance, pod)",
+              "expr": "sum(rate({__name__=~\"vm_streamaggr_ignored_samples_total|vm_streamaggr_dedup_dropped_samples_total\", job=~\"$job\",instance=~\"$instance\", url=~\"$url\"}[$__rate_interval]) > 0) without (instance, pod)",
               "instant": false,
               "legendFormat": "__auto",
               "range": true,
               "refId": "A"
             }
           ],
-          "title": "Ignored samples ($instance)",
+          "title": "Dropped samples ($instance)",
           "type": "timeseries"
         },
         {

deployment/docker/vmanomaly/vmanomaly-integration/compose.yml

@@ -59,7 +59,7 @@ services:
       - '--external.alert.source=explore?orgId=1&left=["now-1h","now","VictoriaMetrics",{"expr": },{"mode":"Metrics"},{"ui":[true,true,true,"none"]}]'
     restart: always
   vmanomaly:
-    image: victoriametrics/vmanomaly:v1.29.5
+    image: victoriametrics/vmanomaly:v1.29.6
     depends_on:
       - "victoriametrics"
     ports:

docs/anomaly-detection/CHANGELOG.md

@@ -14,6 +14,13 @@ aliases:
 ---
 Please find the changelog for VictoriaMetrics Anomaly Detection below.
 
+## v1.29.6
+Released: 2026-06-17
+
+- BUGFIX: Fixed `VLogsReader` startup and query execution when `tenant_id` is omitted or provided in short account-only form such as `"0"`. Omitted or empty tenant IDs are treated as single-node/no-tenant mode, and account-only tenant IDs are expanded to `accountID:0` before adding VictoriaLogs `AccountID`/`ProjectID` params or VM tenant labels.
+
+- BUGFIX: Hardened [`OnlineMADModel`](https://docs.victoriametrics.com/anomaly-detection/components/models/#online-mad) anomaly scoring for perfectly constant time series (all values identical). The model now keeps a small deterministic prediction interval when the learned MAD is zero, so values deviating from an unknown constant baseline can produce `anomaly_score > 1` (previously, all anomaly scores were `0`).
+
 ## v1.29.5
 Released: 2026-06-11
 

docs/anomaly-detection/FAQ.md

@@ -423,7 +423,7 @@ services:
   # ...
   vmanomaly:
     container_name: vmanomaly
-    image: victoriametrics/vmanomaly:v1.29.5
+    image: victoriametrics/vmanomaly:v1.29.6
     # ...
     restart: always
     volumes:
@@ -641,7 +641,7 @@ options:
 Here’s an example of using the config splitter to divide configurations based on the `extra_filters` argument from the reader section:
 
 ```sh
-docker pull victoriametrics/vmanomaly:v1.29.5 && docker image tag victoriametrics/vmanomaly:v1.29.5 vmanomaly
+docker pull victoriametrics/vmanomaly:v1.29.6 && docker image tag victoriametrics/vmanomaly:v1.29.6 vmanomaly
 ```
 
 ```sh

docs/anomaly-detection/Migration.md

@@ -45,7 +45,7 @@ There are 2 types of compatibility to consider when migrating in stateful mode:
 
 | Group start | Group end | Compatibility | Notes |
 |---------|--------- |------------|-------|
-| [v1.29.1](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1291) | [v1.29.5](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1295) | Fully Compatible | - |
+| [v1.29.1](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1291) | [v1.29.6](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1296) | Fully Compatible | - |
 | [v1.28.7](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1287) | [v1.29.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1290) | Partially compatible* | Dumped models of class [prophet](https://docs.victoriametrics.com/anomaly-detection/components/models/#prophet) and [seasonal quantile](https://docs.victoriametrics.com/anomaly-detection/components/models/#online-seasonal-quantile) have problems with loading to [v1.29.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1290) due to dropped `pytz` library. **Upgrading directly from v1.28.7 to [v1.29.1](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1291) with a fix is suggested** |
 | [v1.26.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1262) | [v1.28.7](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1287) | Fully Compatible | [v1.28.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1280) introduced [rolling](https://docs.victoriametrics.com/anomaly-detection/components/models/#rolling-models) model class drop in favor of [online](https://docs.victoriametrics.com/anomaly-detection/components/models/#online-models) models (`rolling_quantile` and `std` models), however, it does not impact compatibility, as artifacts were not produced by default for rolling models. Also, offline `mad` and `zscore` models are redirecting to their respective online counterparts since [v1.28.4](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1284). |
 | [v1.25.3](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1253) | [v1.26.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1270) | Partially Compatible* | [v1.25.3](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1253) introduced `forecast_at` argument for base [univariate](https://docs.victoriametrics.com/anomaly-detection/components/models/#univariate-models) and `Prophet` [models](https://docs.victoriametrics.com/anomaly-detection/components/models/#prophet), however, itself remains backward-reversible from newer states like [v1.26.2](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1262), [v1.27.0](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1270). (All models except `isolation_forest_multivariate` class will be dropped) |

docs/anomaly-detection/QuickStart.md

@@ -132,7 +132,7 @@ Below are the steps to get `vmanomaly` up and running inside a Docker container:
 1. Pull Docker image:
 
 ```sh
-docker pull victoriametrics/vmanomaly:v1.29.5
+docker pull victoriametrics/vmanomaly:v1.29.6
 ```
 
 2. Create the license file with your license key.
@@ -152,7 +152,7 @@ docker run -it \
     -v ./license:/license \
     -v ./config.yaml:/config.yaml \
     -p 8490:8490 \
-    victoriametrics/vmanomaly:v1.29.5 \
+    victoriametrics/vmanomaly:v1.29.6 \
     /config.yaml \
     --licenseFile=/license \
     --loggerLevel=INFO \
@@ -169,7 +169,7 @@ docker run -it \
     -e VMANOMALY_DATA_DUMPS_DIR=/tmp/vmanomaly/data \
     -e VMANOMALY_MODEL_DUMPS_DIR=/tmp/vmanomaly/models \
     -p 8490:8490 \
-    victoriametrics/vmanomaly:v1.29.5 \
+    victoriametrics/vmanomaly:v1.29.6 \
     /config.yaml \
     --licenseFile=/license \
     --loggerLevel=INFO \
@@ -182,7 +182,7 @@ services:
   # ...
   vmanomaly:
     container_name: vmanomaly
-    image: victoriametrics/vmanomaly:v1.29.5
+    image: victoriametrics/vmanomaly:v1.29.6
     # ...
     restart: always
     volumes:

docs/anomaly-detection/UI.md

@@ -315,7 +315,7 @@ docker run -it --rm \
   -e VMANOMALY_MCP_SERVER_URL=http://mcp-vmanomaly:8081/mcp \
   -p 8080:8080 \
   -p 8490:8490 \
-  victoriametrics/vmanomaly:v1.29.5 \
+  victoriametrics/vmanomaly:v1.29.6 \
   vmanomaly_config.yaml
 ```
 

docs/anomaly-detection/components/models.md

@@ -1265,7 +1265,7 @@ monitoring:
 Let's pull the docker image for `vmanomaly`:
 
 ```sh
-docker pull victoriametrics/vmanomaly:v1.29.5
+docker pull victoriametrics/vmanomaly:v1.29.6
 ```
 
 Now we can run the docker container putting as volumes both config and model file:
@@ -1279,7 +1279,7 @@ docker run -it \
 -v $(PWD)/license:/license \
 -v $(PWD)/custom_model.py:/vmanomaly/model/custom.py \
 -v $(PWD)/custom.yaml:/config.yaml \
-victoriametrics/vmanomaly:v1.29.5 /config.yaml \
+victoriametrics/vmanomaly:v1.29.6 /config.yaml \
 --licenseFile=/license
 --watch
 ```

docs/anomaly-detection/guides/guide-vmanomaly-vmalert/README.md

@@ -395,7 +395,7 @@ services:
     restart: always
   vmanomaly:
     container_name: vmanomaly
-    image: victoriametrics/vmanomaly:v1.29.5
+    image: victoriametrics/vmanomaly:v1.29.6
     depends_on:
       - "victoriametrics"
     ports:

docs/guides/guide-vmcluster-multiple-retention-setup/README.md

@@ -6,45 +6,348 @@ build:
 sitemap:
   disable: true
 ---
-**Objective**
 
-Setup Victoria Metrics Cluster with support of multiple retention periods within one installation.
+> [VictoriaMetrics Enterprise](https://docs.victoriametrics.com/victoriametrics/enterprise/) supports specifying multiple retentions for distinct sets of time series and tenants. If you are an Enterprise user, [configure multiple retentions directly through retention filters](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#retention-filters) instead of following this guide.
 
-**Enterprise Solution**
+This guide explains how to set up multiple retentions using an [open-source VictoriaMetrics Cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/).
 
-[VictoriaMetrics Enterprise](https://docs.victoriametrics.com/victoriametrics/enterprise/) supports specifying multiple retentions
-for distinct sets of time series and [tenants](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#multitenancy)
-via [retention filters](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#retention-filters).
+## Overview
 
-**Open Source Solution**
+VictoriaMetrics retains metrics by default for **1 month**. You can change data retention with the [`-retentionPeriod` command-line flag](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#retention), but this value applies to **all time series stored** on a given `vmstorage` node and cannot be customized per tenant or per metric in the open source version. 
 
-Community version of VictoriaMetrics supports only one retention period per `vmstorage` node via [-retentionPeriod](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#retention) command-line flag.
+The core idea of this guide is to run **separate logic groups of storages** (or even clusters) with individual `-retentionPeriod` settings, while still providing a single unified write and read path via vmagent and vmselect.
 
-A multi-retention setup can be implemented by dividing a [victoriametrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/) into logical groups with different retentions.
+## Multi-Retention Architecture
 
-Example:
-Setup should handle 3 different retention groups 3months, 1year and 3 years.
-Solution contains 3 groups of vmstorages + vminserts and one group of vmselects. Routing is done by [vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/)
-by [splitting data streams](https://docs.victoriametrics.com/victoriametrics/vmagent/#splitting-data-streams-among-multiple-systems). 
-The [-retentionPeriod](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#retention) sets how long to keep the metrics.
+To support multiple retentions with the open source version of VictoriaMetrics cluster, you can split the cluster into several logical groups of storage nodes. Each group is configured with a different `-retentionPeriod` and receives only the data that must follow that retention. 
 
-The diagram below shows a proposed solution
+Each storage group is connected to a separate vminsert, while a shared vmselect layer queries across all storage groups so that dashboards and alerts continue to see a single unified VictoriaMetrics backend.
 
 ![Setup](setup.webp)
 
-**Implementation Details**
+In the example used throughout this guide, the cluster is divided into three groups: 
 
-1. Groups of vminserts A know about only vmstorages A and this is explicitly specified via `-storageNode` [configuration](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#cluster-setup). 
-1. Groups of vminserts B know about only vmstorages B and this is explicitly specified via `-storageNode` [configuration](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#cluster-setup). 
-1. Groups of vminserts C know about only vmstorages C and this is explicitly specified via `-storageNode` [configuration](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#cluster-setup). 
-1. vmselect reads data from all vmstorage nodes via `-storageNode` [configuration](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#cluster-setup) 
-   with [deduplication](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#deduplication) setting equal to vmagent's scrape interval or minimum interval between collected samples. 
-1. vmagent routes incoming metrics to the given set of `vminsert` nodes using relabeling rules specified at `-remoteWrite.urlRelabelConfig` [configuration](https://docs.victoriametrics.com/victoriametrics/relabeling/).
+- Group A: 3-month retention.
+- Group B: 1-year retention.
+- Group C: 3-year retention. 
 
-**Multi-Tenant Setup**
+Metrics are routed to the appropriate vminsert group by splitting data streams in vmagent, so each time series is sent to exactly one retention group instead of being replicated to all groups. See [Deploying vmagent](https://docs.victoriametrics.com/guides/guide-vmcluster-multiple-retention-setup/#step3) for an example of label‑based routing that implements this split. An optional [vmauth](https://docs.victoriametrics.com/guides/guide-vmcluster-multiple-retention-setup/#additional-enhancements) layer can be added on top to restrict access to specific sub‑clusters or tenants while still keeping a unified write and read path.
 
-Every group of vmstorages can handle one tenant or multiple one. Different groups can have overlapping tenants. As vmselect reads from all vmstorage nodes, the data is aggregated on its level.
+## Implementing Multi-Retention on Kubernetes
 
-**Additional Enhancements**
+In this section, we'll install and configure the components for a multi-retention deployment of the VictoriaMetrics cluster. See [Kubernetes monitoring with VictoriaMetrics Cluster](https://docs.victoriametrics.com/guides/k8s-monitoring-via-vm-cluster/) for details on running VictoriaMetrics in Kubernetes.
 
-You can set up [vmauth](https://docs.victoriametrics.com/victoriametrics/vmauth/) for routing data to the given vminsert group depending on the needed retention.
+Run the following command to add the VictoriaMetrics Helm repository:
+
+```shell
+helm repo add vm https://victoriametrics.github.io/helm-charts/
+helm repo update
+```
+
+### Step 1: Deploying storage groups {#step1}
+
+We'll create three storage groups. Each has a different retention period and disk size. Read [Understand Your Setup Size](https://docs.victoriametrics.com/guides/understand-your-setup-size/) to estimate how much space you will need for each group. The following table is shown as an example:
+
+
+| Group        | Retention Period | Total disk size       |
+|--------------|------------------|-----------------------|
+| `vmcluster-a`  | 3 months (`3M`)    | 80 Gi                 |
+| `vmcluster-b`  | 1 year (`1Y`)      | 300 Gi                |
+| `vmcluster-c`  | 3 years (`3Y`)     | 900 Gi                |
+
+Create a Helm values file for Group A.
+
+```shell
+cat <<EOF > vmcluster-a.yaml
+vmstorage:
+  enabled: true
+  replicaCount: 1
+  persistence:
+    size: 80Gi
+  extraArgs:
+    retentionPeriod: 3M
+  podLabels:
+    retention-group: a
+
+vminsert:
+  enabled: true
+  podLabels:
+    retention-group: a
+
+vmselect:
+  enabled: false
+EOF
+```
+
+The values file above creates vminsert and vmstorage services while turning off vmselect, which we'll deploy separately. The `retentionPeriod` flag configures how long data is kept in this group.
+
+Create the values files for Group B and Group C:
+
+```shell
+cat <<EOF > vmcluster-b.yaml
+vmstorage:
+  enabled: true
+  replicaCount: 1
+  persistence:
+    size: 300Gi
+  extraArgs:
+    retentionPeriod: 1y
+  podLabels:
+    retention-group: b
+
+vminsert:
+  enabled: true
+  podLabels:
+    retention-group: b
+
+vmselect:
+  enabled: false
+EOF
+
+
+cat <<EOF > vmcluster-c.yaml
+vmstorage:
+  enabled: true
+  replicaCount: 1
+  persistence:
+    size: 900Gi
+  extraArgs:
+    retentionPeriod: 3y
+  podLabels:
+    retention-group: c
+
+vminsert:
+  enabled: true
+  podLabels:
+    retention-group: c
+
+vmselect:
+  enabled: false
+EOF
+```
+
+Deploy the three storage groups with:
+
+```shell
+helm upgrade --install vmcluster-a vm/victoria-metrics-cluster -f vmcluster-a.yaml
+helm upgrade --install vmcluster-b vm/victoria-metrics-cluster -f vmcluster-b.yaml
+helm upgrade --install vmcluster-c vm/victoria-metrics-cluster -f vmcluster-c.yaml
+
+# Wait for all storage pods to be ready
+kubectl rollout status statefulset -l app.kubernetes.io/instance=vmcluster-a
+kubectl rollout status statefulset -l app.kubernetes.io/instance=vmcluster-b
+kubectl rollout status statefulset -l app.kubernetes.io/instance=vmcluster-c
+```
+
+### Step 2: Deploying vmselect {#step2}
+
+Next, we'll deploy a vmselect service to route queries to the storage groups.
+
+Create a Helm values file with:
+
+```shell
+cat <<EOF >vmselect.yaml
+vmstorage:
+  enabled: false
+
+vminsert:
+  enabled: false
+
+vmselect:
+  enabled: true
+  replicaCount: 1
+  suppressStorageFQDNsRender: true
+  extraArgs:
+    # Each list item is a single -storageNode flag. In this example, there is
+    # one vmstorage pod per retention group, so each entry contains a single host.
+    # If you run multiple pods per group, list them as comma-separated hosts
+    # in the same -storageNode value.
+    #
+    # The FQDN format is:
+    #   <pod>.<svc>.default.svc
+    # where pod = <release>-victoria-metrics-cluster-vmstorage-<N>
+    # and   svc = <release>-victoria-metrics-cluster-vmstorage
+    storageNode:
+      - "vmcluster-a-victoria-metrics-cluster-vmstorage-0.vmcluster-a-victoria-metrics-cluster-vmstorage.default.svc:8401"
+      - "vmcluster-b-victoria-metrics-cluster-vmstorage-0.vmcluster-b-victoria-metrics-cluster-vmstorage.default.svc:8401"
+      - "vmcluster-c-victoria-metrics-cluster-vmstorage-0.vmcluster-c-victoria-metrics-cluster-vmstorage.default.svc:8401"
+EOF
+```
+
+Let's break down the file above:
+
+- Deploys vmselect as a separate Helm release. 
+- Disables vminsert and vmstorage as these services were already deployed in Step 1.
+- `suppressStorageFQDNsRender: true` turns off automatic FQDN generation for storage nodes. By default, the Helm chart auto-generates `-storageNodes` flags, but since `vmstorage` has been disabled, we need to supply them manually in `extraArgs`.
+- In `extraArgs.storageNode:` we define the vmstorage endpoints for queries. On querying, vmselect merges results across all the specified vmstorages to provide a unified view of the data.
+
+Deploy the `vmselect` release with:
+
+```shell
+helm upgrade --install vmselect vm/victoria-metrics-cluster -f vmselect.yaml
+```
+
+### Step 3: Deploying vmagent {#step3}
+
+We'll use `vmagent` to route incoming metrics to the correct retention group. For example, we can use a `retention` label for mapping metrics to storage groups in the following way:
+
+| `retention` label | Storage Group |
+|-------------------|--------------|
+| `"3mo"`           | `vmcluster-a` |
+| `"1yr"`           | `vmcluster-b` |
+| `"3yr"`           | `vmcluster-c` |
+
+
+Create the values file for vmagent:
+
+```shell
+cat <<EOF >vmagent.yaml
+service:
+  enabled: true
+remoteWrite:
+  # Group A: receives metrics with retention="3mo"
+  - url: http://vmcluster-a-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write
+    urlRelabelConfig:
+      - if: '{retention="3mo"}'
+        action: keep
+  # Group B: receives metrics with retention="1yr"
+  - url: http://vmcluster-b-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write
+    urlRelabelConfig:
+      - if: '{retention="1yr"}'
+        action: keep
+  # Group C: receives metrics with retention="3yr"
+  - url: http://vmcluster-c-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write
+    urlRelabelConfig:
+      - if: '{retention="3yr"}'
+        action: keep
+EOF
+```
+
+> Metrics without a matching `retention` label are silently dropped by the `keep` rules. You must ensure that every metric is labeled, or use a different routing configuration.
+
+Now deploy the vmagent release:
+
+```shell
+helm upgrade --install vmagent vm/victoria-metrics-agent -f vmagent.yaml
+```
+
+Wait for vmagent to become ready:
+
+```shell
+kubectl rollout status deploy/vmagent-victoria-metrics-agent
+```
+
+### Step 4: Verification
+
+We can send test data to verify that the data is flowing to the correct storage group.
+
+First, port-forward vmagent and vmselect:
+
+```shell
+VMAGENT_SVC=$(kubectl get svc -l app.kubernetes.io/instance=vmagent -o jsonpath='{.items[0].metadata.name}')
+kubectl port-forward "svc/$VMAGENT_SVC" 8429 &
+
+VMSELECT_SVC=$(kubectl get svc -l app.kubernetes.io/instance=vmselect -o jsonpath='{.items[0].metadata.name}')
+kubectl port-forward "svc/$VMSELECT_SVC" 8481 &
+```
+
+Send test metrics directly to vmagent's HTTP endpoint to exercise all three retention labels:
+
+```shell
+POD=$(kubectl get pod -l app.kubernetes.io/instance=vmagent -o jsonpath='{.items[0].metadata.name}')
+
+for retention in 3mo 1yr 3yr; do
+  kubectl exec "$POD" -- wget -qO- --post-data="test_routing{retention=\"${retention}\"} 1.0" \
+    "http://127.0.0.1:8429/api/v1/import/prometheus"
+done
+```
+
+Query the data back from vmselect (it may take around 30-60 seconds for new data to be available for queries):
+
+```shell
+for retention in 3mo 1yr 3yr; do
+  echo "-> retention=${retention}"
+  curl -s "http://localhost:8481/select/0/prometheus/api/v1/query" \
+    --data-urlencode "query=test_routing{retention=\"${retention}\"}"
+  echo
+done
+```
+
+You can also check that vmagent is forwarding data to all three groups:
+
+```shell
+curl -s http://localhost:8429/metrics | grep vmagent_remotewrite_blocks_sent_total
+```
+
+Each `url="N:secret-url"` corresponds to one `remoteWrite` entry (N=1 for Group A, N=2 for Group B, N=3 for Group C). Non-zero values confirm data is flowing.
+
+## Alternative Routing by Existing Labels
+
+The example setup above relies on a synthetic `retention` label to exist in every incoming metric.
+
+If having a `retention` label in every metric isn't practical, you can, as an alternative, rely on existing labels to map data to the correct storage group.
+
+The following example configures vmagent to route metrics based on the `environment` and `team` labels:
+
+```yaml
+# vmagent.yaml
+remoteWrite:
+  # send dev and staging data to Group A
+  - url: "http://vmcluster-a-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write"
+    urlRelabelConfig:
+      - if: {environment=~"dev|staging"}
+        action: keep
+  # send prod data to Group B
+  - url: "http://vmcluster-b-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write"
+    urlRelabelConfig:
+      - if: {environment=~"prod|production"}
+        action: keep
+  # send data from Infra and SRE teams to Group C
+  - url: "http://vmcluster-c-victoria-metrics-cluster-vminsert:8480/insert/0/prometheus/api/v1/write"
+    urlRelabelConfig:
+      - if: {team=~"infra|sre"}
+        action: keep
+```
+
+> Metrics that do not match any of the `keep` rules are dropped in the configuration above.
+
+## Additional Enhancements
+
+You can set up [vmauth](https://docs.victoriametrics.com/victoriametrics/vmauth/) to route data to the specified vminsert group based on the required retention or to restrict which data different users can query.
+
+The following [`-auth.config`](https://docs.victoriametrics.com/victoriametrics/vmauth/#quick-start) example exposes the same vmselect backend via vmauth with two users using basic auth:
+
+- `admin`: can query **all** data across all retention groups.
+- `dev`: can query **only** time series that have `team="dev"` label, enforced via the `extra_label` query argument.
+
+```yaml
+users:
+  # User with access to all data across all retention groups
+  - username: "admin"
+    password: "foo"
+    url_map:
+      - src_paths:
+          - "/api/v1/query"
+          - "/api/v1/query_range"
+          - "/api/v1/series"
+          - "/api/v1/labels"
+          - "/api/v1/label/.+/values"
+        # vmselect service that aggregates all vmstorage groups
+        url_prefix: "http://vmselect-victoria-metrics-cluster-vmselect:8481/select/0/prometheus"
+
+  # User restricted to Dev team data only
+  - username: "dev"
+    password: "bar"
+    url_map:
+      - src_paths:
+          - "/api/v1/query"
+          - "/api/v1/query_range"
+          - "/api/v1/series"
+          - "/api/v1/labels"
+          - "/api/v1/label/.+/values"
+        # Same vmselect backend, but enforce label filter at query time
+        # by adding extra_label=team=dev to every proxied request
+        url_prefix: "http://vmselect-victoria-metrics-cluster-vmselect:8481/select/0/prometheus/?extra_label=team=dev"
+```
+
+This is useful for restricting access by team, environment, or tenant without changing the underlying storage topology.

docs/victoriametrics/Articles.md

@@ -19,6 +19,7 @@ See also [case studies](https://docs.victoriametrics.com/victoriametrics/casestu
 * [Datanami: Why Roblox Picked VictoriaMetrics for Observability Data Overhaul](https://www.hpcwire.com/bigdatawire/2023/05/30/why-roblox-picked-victoriametrics-for-observability-data-overhaul/)
 * [Cloudflare: Introducing notifications for HTTP Traffic Anomalies](https://blog.cloudflare.com/introducing-http-traffic-anomalies-notifications/)
 * [Grammarly: Better, Faster, Cheaper: How Grammarly Improved Monitoring by Over 10x with VictoriaMetrics](https://www.grammarly.com/blog/engineering/monitoring-with-victoriametrics/)
+* [Xata: How we rebuilt PostgreSQL branch metrics on VictoriaMetrics, per cell](https://xata.io/blog/how-we-rebuilt-postgresql-branch-metrics-on-victoriametrics-per-cell)
 * [CERN: CMS monitoring R&D: Real-time monitoring and alerts](https://indico.cern.ch/event/877333/contributions/3696707/attachments/1972189/3281133/CMS_mon_RD_for_opInt.pdf)
 * [CERN: The CMS monitoring infrastructure and applications](https://arxiv.org/pdf/2007.03630.pdf)
 * [Forbes: The (Almost) Infinitely Scalable Open Source Monitoring Dream](https://www.forbes.com/sites/adrianbridgwater/2022/08/16/the-almost-infinitely-scalable-open-source-monitoring-dream/)

docs/victoriametrics/CONTRIBUTING.md

@@ -28,7 +28,7 @@ If you like VictoriaMetrics and want to contribute, then it would be great:
 ## Issues
 
 When making a new issue, make sure to create no duplicates. Use GitHub search to find whether similar issues exist already.
-The new issue should be written in English and contain concise description of the problem and environment where it exists.
+The new issue should be written in English and contain a concise description of the problem and the environment where it exists.
 We'd very much prefer to have a specific use-case included in the description, since it could have workaround or alternative solutions.
 
 When looking for an issue to contribute, always prefer working on [bugs](https://github.com/VictoriaMetrics/VictoriaMetrics/issues?q=is%3Aopen+is%3Aissue+label%3Abug)
@@ -48,7 +48,7 @@ We use [labels](https://docs.github.com/en/issues/using-labels-and-milestones-to
 1. `need more info`, assigned to issues that require elaboration from the issue creator.
   For example, if we weren't able to reproduce the reported bug based on the ticket description then we ask additional
   questions which could help to reproduce the issue and add `need more info` label. This label helps other maintainers
-  to understand that this issue wasn't forgotten but waits for the feedback from user.
+  to understand that this issue wasn't forgotten but waits for the feedback from the user.
 1. `completed`, assigned to issues that required code changes and those changes were merged to upstream, but not released yet.
   Once a release is made, maintainers go through all labeled issues, leave a comment about the new release, and close the issue.
 1. `vmui`, assigned to issues related to [vmui](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmui) or [VictoriaLogs webui](https://docs.victoriametrics.com/victorialogs/querying/#web-ui)
@@ -63,32 +63,31 @@ Pull requests requirements:
 1. Don't use `master` branch for making PRs, as it makes it impossible for reviewers to modify the changes.
 1. All commits need to be [signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits).
 1. Pull request title should be prefixed with `<dir>/<component>:` to show what component has been changed, i.e. `app/vmalert: fix...`.
-   Pull request description should contain clear and concise description of what was done, why it is needed and for what purpose.
+   Pull request description should contain a clear and concise description of what was done, why it is needed and for what purpose.
    Use clear language, so reviewers can quickly understand the change and its impact.
 1. A link to the issue(s) related to the change, if any. Use `Fixes [issue link]` if the PR resolves the issue, or `Related to [issue link]` for reference.
 1. Tests proving that the change is effective. Tests are expected for non-trivial new functionality or non-trivial modifications.
    Bug fixes must include tests unless a maintainer explicitly agrees otherwise.
-   See [this style guide](https://itnext.io/f-tests-as-a-replacement-for-table-driven-tests-in-go-8814a8b19e9e) for tests.
-   To run tests and code checks locally, execute commands `make test-full` and `make check-all`.
+   See [this style guide](https://itnext.io/f-tests-as-a-replacement-for-table-driven-tests-in-go-8814a8b19e9e) for tests. See [this section](#testing) for how to run tests.
 1. Try to not extend the scope of the pull requests outside the issue, do not make unrelated changes.
-1. Update [docs](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/docs) if needed. For example, adding a new flag or changing behavior of existing flags or features
+1. Update [docs](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/docs) if needed. For example, adding a new flag or changing the behavior of existing flags or features
    requires reflecting these changes in the documentation. For new features add `{{%/* available_from "#" */%}}` shortcode to the documentation.
    It will be later automatically replaced with an actual release version.
 1. A line in the [changelog](https://docs.victoriametrics.com/victoriametrics/changelog/#tip) mentioning the change and related issue in a way
    that would be clear to other readers even if they don't have the full context.
-1. Avoid modifying code in the `/vendor` folder manually, even when the vendored package originates are from the VictoriaMetrics GitHub organization.
+1. Avoid modifying code in the `/vendor` folder manually, even when the vendored package originates from the VictoriaMetrics GitHub organization.
    For instance, VictoriaLogs vendors packages under the `/lib` folder from VictoriaMetrics, and VictoriaTraces vendors the `/lib/logstorage` package from VictoriaLogs.
-   Submit a pull request to the upstream repository first. Afterward, a separate pull request can be opened to update the version of the vendored folder in downstream repository.
+   Submit a pull request to the upstream repository first. Afterward, a separate pull request can be opened to update the version of the vendored folder in the downstream repository.
    * For common packages, the vendored package can be updated with this command: `go get <dependency>@vX.Y.Z`.  
    * For VictoriaMetrics packages, use `go get <dependency>@canonical_commit_hash`. 
    Finally, run `go mod tidy` and `go mod vendor` to update `go.mod`, `go.sum`, and `/vendor`.
 1. Ping reviewers who you think have the best expertise on the matter.
 
-See good example of a [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6487).
+See a good example of a [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6487).
 
 ## Merging Pull Request
 
-The person who merges the Pull Request is responsible for satisfying requirements below:
+The person who merges the Pull Request is responsible for satisfying the requirements below:
 
 1. Make sure that PR satisfies [Pull Request checklist](https://docs.victoriametrics.com/victoriametrics/contributing/#pull-request-checklist),
    it is approved by at least one reviewer, all CI checks are green.
@@ -97,9 +96,9 @@ The person who merges the Pull Request is responsible for satisfying requirement
 1. If applicable, cherry-pick the change to [LTS release lines](https://docs.victoriametrics.com/victoriametrics/lts-releases/)
    and mention in the PR comment what was or wasn't cherry-picked.
 1. Update related issues with a meaningful message of what has changed and when it will be
-   released. _This helps users to understand the change without reading PR._
+   released. _This helps users to understand the change without reading the PR._
 1. Add label `completed` to related issues.
-1. Do not close related tickets until release is made. If ticket was auto-closed by GitHub or user - re-open it.
+1. Do not close related tickets until the release is made. If the ticket was auto-closed by GitHub or a user - re-open it.
 
 ## KISS principle
 
@@ -115,9 +114,9 @@ We are open to third-party pull requests provided they follow [KISS design princ
 - Minimize the number of moving parts in the distributed system.
 - Avoid automated decisions, which may hurt cluster availability, consistency, performance or debuggability.
 
-Adhering to `KISS` principle, simplifies the resulting code and architecture so it can be reviewed, understood and debugged by a wider audience.
+Adhering to the `KISS` principle, simplifies the resulting code and architecture so it can be reviewed, understood and debugged by a wider audience.
 
-Due to `KISS`, [cluster version of VictoriaMetrics](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/) has none of the following "features" popular in distributed computing world:
+Due to `KISS`, [cluster version of VictoriaMetrics](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/) has none of the following "features" popular in distributed computing:
 
 - Fragile gossip protocols. See [failed attempt in Thanos](https://github.com/improbable-eng/thanos/blob/030bc345c12c446962225221795f4973848caab5/docs/proposals/completed/201809_gossip-removal.md).
 - Hard-to-understand-and-implement-properly [Paxos protocols](https://www.quora.com/In-distributed-systems-what-is-a-simple-explanation-of-the-Paxos-algorithm).
@@ -126,3 +125,17 @@ Due to `KISS`, [cluster version of VictoriaMetrics](https://docs.victoriametrics
 - Automatic cluster resizing, which may cost you a lot of money if improperly configured.
 - Automatic discovering and addition of new nodes in the cluster, which may mix data between dev and prod clusters :)
 - Automatic leader election, which may result in split brain disaster on network errors.
+
+## Testing
+
+We recommend running the following sequence of checks and tests before submitting a pull request:
+```sh
+# run static checks
+make check-all
+
+# run unit test
+make test-full
+
+# run integration tests
+make apptest
+```

docs/victoriametrics/changelog/CHANGELOG.md

@@ -26,7 +26,34 @@ See also [LTS releases](https://docs.victoriametrics.com/victoriametrics/lts-rel
 
 ## tip
 
-* BUGFIX: [stream aggregation](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/): fix issue with producing aggregated samples with identical timestamps between flushes. See PR [#10808](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10808) for details.
+## [v1.146.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.146.0)
+
+Release candidate
+
+* FEATURE: all VictoriaMetrics components: add `-http.header.disableServerHostname` command-line flag for disabling the `X-Server-Hostname` HTTP response header. See [#11067](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11067). Thanks to @zasdaym for contribution.
+* FEATURE: [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): log calls to [/api/v1/admin/tsdb/delete_series](https://docs.victoriametrics.com/victoriametrics/url-examples/#apiv1admintsdbdelete_series) API handler. This should help to identify events of metrics deletion from the database. See [#11104](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11104).
+* FEATURE: [vmctl](https://docs.victoriametrics.com/victoriametrics/vmctl/): add `-vm-headers` and `-vm-bearer-token` flags for authenticating requests to the VictoriaMetrics import destination. The flags are available in `opentsdb`, `influx`, `remote-read`, `prometheus`, `mimir`, and `thanos` vmctl sub-commands. See [#8897](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8897).
+* FEATURE: [vmui](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmui): add the `last` value to graph legend statistics. See [#10759](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10759).
+* FEATURE: [stream aggregation](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/): expose `vm_streamaggr_dedup_dropped_samples_total` to allow tracking dropped old samples during [deduplication](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#deduplication).
+* FEATURE: [stream aggregation](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/): use the aggregation rule interval as the default [staleness_interval](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#staleness) instead of `2*interval`, to reduce spikes when there are gaps between received samples. See [#11102](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11102).
+* FEATURE: [vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/): add a new flag `-remoteWrite.inmemoryQueues` to prioritize recently ingested data over historical data stored at file-based [persistent queue](https://docs.victoriametrics.com/victoriametrics/vmagent/#on-disk-persistence-and-data-processing-order). See [#8833](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8833)
+*  FEATURE: [vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/): add `-promscrape.cluster.shardByLabels` command-line flag for selecting target labels used for sharding scrape targets among `vmagent` instances in cluster mode. See [#11044](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11044).
+* FEATURE: [vmctl](https://docs.victoriametrics.com/victoriametrics/vmctl/): add `-vm-headers` and `-vm-bearer-token` flags for authenticating requests to the VictoriaMetrics import destination. The flags are available in `opentsdb`, `influx`, `remote-read`, `prometheus`, `mimir`, and `thanos` vmctl sub-commands. See [#8897](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8897).
+* FEATURE: [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): log calls to [/api/v1/admin/tsdb/delete_series](https://docs.victoriametrics.com/victoriametrics/url-examples/#apiv1admintsdbdelete_series) API handler. This should help to identify events of metrics deletion from the database. See [#11104](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11104).
+* FEATURE: [vmui](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmui): add the `last` value to graph legend statistics. See [#10759](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10759).
+
+* BUGFIX: [enterprise](https://docs.victoriametrics.com/enterprise/) [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): properly expose metric `vm_retention_filters_partitions_scheduled_rows`. See [#11138](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11138)
+* BUGFIX: [stream aggregation](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/): fix issue with producing aggregated samples with identical timestamps between flushes. See [#10808](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10808).
+* BUGFIX: [vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/): fix potential corruption of remote-write metadata `Unit` values. See [#11120](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11120). Thanks for @fxrlv for the contribution.
+* BUGFIX: [vmalert](https://docs.victoriametrics.com/victoriametrics/vmalert/),[vmauth](https://docs.victoriametrics.com/victoriametrics/vmauth/),[vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/) and [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/): fix rare unbounded shutdown delay when config reload takes longer than `-configCheckInterval`. See [#11107](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11107). Thanks to @PleasingFungus for contribution.
+* BUGFIX: [vmbackup](https://docs.victoriametrics.com/vmbackup/), [vmbackupmanager](https://docs.victoriametrics.com/victoriametrics/vmbackupmanager/): do not fail backup list if directory is absent while using `fs://` destination to align with other protocols. See [6c3c548d](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/6c3c548ddb0385b749e731f52276f130e2a4e4a8).
+* BUGFIX: [vmctl](https://docs.victoriametrics.com/victoriametrics/vmctl/): push metrics to configured `-pushmetrics.url` on shutdown when migration fails. Previously, metrics were not pushed if vmctl exited with an error. See [#11081](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11081). Thanks to @zasdaym for contribution.
+* BUGFIX: [vmrestore](https://docs.victoriametrics.com/victoriametrics/vmrestore/): disallow restoring parts outside the configured `-storageDataPath` directory. See [710c920d](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/710c920d6083327042a309e449fae4383617d817).
+* BUGFIX: `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): correctly apply long tenant filters. Previously, such filters could be truncated, causing tenants to be matched incorrectly. See [#11096](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11096). Thanks for @fxrlv for the contribution.
+* BUGFIX: `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): fix corrupted metrics metadata when a response contains multiple rows. See [#11115](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11115). Thanks for @fxrlv for the contribution.
+* BUGFIX: `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): don't cache empty responses for tenant IDs discovery during [multitenant queries](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenant-reads). This problem was visible during integration tests when multitenant queries were executed before the first ingestion happened. See [#10982](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10982)
+* BUGFIX: [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): properly escape `metricFamilyName` at metrics metadata response. See [#11129](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11129). Thanks for @fxrlv for the contribution.
+* BUGFIX: [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): prevent more cases of panic during directory deletion on `NFS`-based mounts. See [#11060](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11060).
 
 ## [v1.145.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.145.0)
 

docs/victoriametrics/stream-aggregation/README.md

@@ -76,7 +76,7 @@ It is better to substitute the slow recording rule with the following [stream ag
   outputs: [rate_sum]
 ```
 
-> Field `interval` should be set to a value at least several times higher than the matched metrics collection interval. 
+> It is recommended to set the `interval` field to a value at least 2 times the matched metrics collection interval.
 
 This stream aggregation generates `http_request_duration_seconds_bucket:1m_without_instance_rate_sum` output series according to [output metric naming](#output-metric-names).
 Then these series can be used in [alerting rules](https://docs.victoriametrics.com/victoriametrics/vmalert/#alerting-rules):
@@ -396,7 +396,7 @@ before sending them to the configured `-remoteWrite.url`. The deduplication can
 
 Labels can be dropped before deduplication is applied. See [these docs](#dropping-unneeded-labels).
 
-Stream aggregation deduplication is applied before aggregation rules, so duplicate samples are dropped before aggregation.
+Stream aggregation deduplication is applied before aggregation rules, so duplicate samples are dropped before aggregation. The dropped old samples can be tracked with the `vm_streamaggr_dedup_dropped_samples_total` metric.
 
 # Relabeling
 
@@ -444,7 +444,9 @@ outside the current [aggregation interval](https://docs.victoriametrics.com/vict
 
 - To enable [aggregation windows](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#aggregation-windows).
 
-The dropped old samples can be tracked with the `vm_streamaggr_ignored_samples_total{reason="too_old"}` metric.
+- To enable [deduplication](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#deduplication).
+
+The dropped old samples can be tracked with the `vm_streamaggr_ignored_samples_total{reason="too_old"}` and `vm_streamaggr_dedup_dropped_samples_total` metrics.
 
 ## Ignore aggregation intervals on start
 
@@ -642,9 +644,9 @@ See also [why you shouldn't put an aggregator behind a load balancer](https://do
 
 # Troubleshooting
 
-- [Unexpected spikes for `total` or `increase` outputs](#staleness).
+- [Unexpected spikes for `total` or `increase` outputs](#data-delay-and-staleness).
 - [Excessively large values for `total*`, `increase*`, and `rate*` outputs](#counter-resets).
-- [Lower than expected values for `total_prometheus` and `increase_prometheus` outputs](#staleness).
+- [Lower than expected values for `total_prometheus` and `increase_prometheus` outputs](#data-delay-and-staleness).
 - [High memory usage and CPU usage](#high-resource-usage).
 - [Unexpected results in vmagent cluster mode](#cluster-mode).
 - [Inaccurate aggregation results for histograms](#aggregation-windows)
@@ -677,11 +679,19 @@ the following settings:
 
 If counter-specific outputs, such as `total*`, `rate*`, and `increase*`, produce values that are significantly higher than anticipated, then check the `vm_streamaggr_counter_resets_total` metric. This metric increments each time when [counter reset event](https://docs.victoriametrics.com/victoriametrics/keyconcepts/#counter) happens and could be caused by duplication or collision of raw samples. If you observe duplication or collision, try solving this problem by either fixing the source of these metrics or by [deduplicating](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#deduplication) these samples before aggregation.
 
-## Staleness
+## Data delay and staleness {#staleness}
 
-The following outputs track the last seen per-series values in order to properly calculate output values:
+Stream aggregation processes input samples in a streaming manner and flushes results once per specified `interval`. Because of this, aggregation results can be heavily affected by data delays (see `vm_streamaggr_samples_lag_seconds_bucket` metric).
+
+In particular:
+1. Stream aggregation won't produce results if input samples are delayed for multiple aggregation intervals, causing gaps in the output.
+2. Delayed and out-of-order samples can inflate or skew correctness of aggregation results.
+
+Dropping delayed samples can result in missed observations in the results, while keeping delayed samples may inflate the results. It is up to the user to decide what they prefer in the produced results:
+1. If you prefer consistency in aggregation results and do not want delayed data to affect the next aggregation window, drop all potentially delayed samples via [ignore_old_samples](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#ignoring-old-samples).
+2. If you prefer to have the accumulated changes from delayed data reflected in aggregation windows after the delay, increase `staleness_interval` in the [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config).
+This is especially important for outputs that track the last seen per-series values in order to properly calculate output values:
 
-- [histogram_bucket](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#histogram_bucket)
 - [increase](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase)
 - [increase_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase_prometheus)
 - [rate_avg](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#rate_avg)
@@ -689,21 +699,19 @@ The following outputs track the last seen per-series values in order to properly
 - [total](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total)
 - [total_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total_prometheus)
 
-The last seen per-series value is dropped if no new samples are received for the given time series during two consecutive aggregations
-intervals specified in [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config) via `interval` option.
+For these outputs, the last seen per-series value is dropped if no new samples are received for the given time series during consecutive aggregation intervals specified in the [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config) via `interval` option.
 If a new sample for the existing time series is received after that, then it is treated as the first sample for a new time series.
-This may lead to the following issues:
+This may lead to the following issues when data is delayed:
 
-- Lower than expected results for [total_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total_prometheus) and [increase_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase_prometheus) outputs,
-  since they ignore the first sample in a new time series.
-- Unexpected spikes for [total](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total) and [increase](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase) outputs, since they assume that new time series start from 0.
+- [total](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total) and [increase](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase) may produce unexpected spikes, since they assume that a new time series starts from `0`.
+- [total_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#total_prometheus) and [increase_prometheus](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#increase_prometheus) may produce lower than expected results, if you expect to see the accumulated changes reflected after the delay, since they ignore the first sample in a new time series.
 
-These issues can be fixed in the following ways:
+These issues can be improved in the following ways:
 
 - By increasing the `interval` option at [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config), so it covers the expected
-  delays in data ingestion pipelines.
-- By specifying the `staleness_interval` option at [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config), so it covers the expected
-  delays in data ingestion pipelines. By default, the `staleness_interval` is equal to `2 x interval`.
+  delays in data ingestion pipelines. It is recommended to set `interval` to at least 2× the scrape or push interval of the input. Set it to a higher value if the input pipeline is prone to large delays.
+- By increasing the `staleness_interval` option in the [stream aggregation config](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/configuration/#stream-aggregation-config), so it covers the expected
+  delays in data ingestion pipelines. By default, the `staleness_interval` is equal to `interval`.
 
 ## High resource usage
 

docs/victoriametrics/stream-aggregation/configuration.md

@@ -66,6 +66,8 @@ specified individually per each `-remoteWrite.url`:
 
   # interval is the interval for the aggregation.
   # The aggregated stats is sent to remote storage once per interval.
+  # It is recommended to set `interval` to at least 2× the scrape or push interval of the input.
+  # Set it to a higher value if the input pipeline is prone to large delays.
   #
   interval: 1m
 
@@ -94,7 +96,7 @@ specified individually per each `-remoteWrite.url`:
   # - total_prometheus
   # See https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#staleness for more details.
   #
-  # staleness_interval: 2m
+  # staleness_interval: 1m
 
   # ignore_first_sample_interval specifies the interval after which the agent begins sending samples.
   # By default, it is set to the staleness interval, and it helps reduce the initial sample load after an agent restart.
@@ -291,9 +293,6 @@ The results of `histogram_bucket` is equal to the following [MetricsQL](https://
 sum(histogram_over_time(some_histogram_bucket[interval])) by (vmrange)
 ```
 
-Aggregating irregular and sporadic metrics (received from [Lambdas](https://aws.amazon.com/lambda/)
-or [Cloud Functions](https://cloud.google.com/functions)) can be controlled via [staleness_interval](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/#staleness) option.
-
 See also:
 - [quantiles](#quantiles)
 - [avg](#avg)
@@ -507,6 +506,19 @@ See also:
 - [count_samples](#count_samples)
 - [count_series](#count_series)
 
+### `sum_samples_total`
+
+`sum_samples_total` sums input delta values into a cumulative [counter](https://docs.victoriametrics.com/victoriametrics/keyconcepts/index.html#counter) and outputs the result at the given `interval`.
+`sum_samples_total` makes sense only for aggregating delta values from clients such as [StatsD counter](https://github.com/statsd/statsd/blob/master/docs/metric_types.md#counting).
+
+The results of `sum_samples_total` is roughly equal to the following [MetricsQL](https://docs.victoriametrics.com/victoriametrics/metricsql/) query:
+
+```metricsql
+sum(running_sum(some_delta_values))
+```
+
+>Note: The aggregator will forget the cumulative counter if it has not seen input samples for `staleness_interval`(set to `interval` by default) per output result, so the output counter will start from `0` the next time it sees the input again. Increase the `staleness_interval` option if you want to extend the window to tolerate bigger gaps.
+
 ### total
 
 `total` generates output [counter](https://docs.victoriametrics.com/victoriametrics/keyconcepts/#counter) by summing the input counters over the given `interval`.

docs/victoriametrics/victoria_metrics_common_flags.md

@@ -95,6 +95,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string
@@ -621,7 +623,7 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/
   -version
      Show VictoriaMetrics version
   -vmalert.proxyURL string
-     Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules
+     Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules . See https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmalert
   -vmui.customDashboardsPath string
      Optional path to vmui dashboards. See https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/app/vmui/packages/vmui/public/dashboards
   -vmui.defaultTimezone string

docs/victoriametrics/vmagent.md

@@ -797,6 +797,12 @@ For example, the following commands spread scrape targets among a cluster of two
 The `-promscrape.cluster.memberNum` can be set to a StatefulSet pod name when `vmagent` runs in Kubernetes.
 The pod name must end with a number in the range `0 ... promscrape.cluster.membersCount-1`. For example, `-promscrape.cluster.memberNum=vmagent-0`.
 
+By default, targets are sharded among `vmagent` instances by all target labels after relabeling.
+Use `-promscrape.cluster.shardByLabels` {{% available_from "v1.146.0" %}} to shard targets by specified labels instead.
+For example, with `-promscrape.cluster.shardByLabels=service`, the targets with the same `service` label value will be scraped by the same `vmagent` instance, 
+which is useful when perform stream aggregation that requires all metrics with the same `service` label value to be processed on the same `vmagent` instance. 
+If none of the specified labels are present in the target labels, then all target labels will be used for sharding.
+
 By default, each scrape target is scraped only by a single `vmagent` instance in the cluster. If there is a need for replicating scrape targets among multiple `vmagent` instances,
 then `-promscrape.cluster.replicationFactor` command-line flag must be set to the desired number of replicas. For example, the following commands
 start a cluster of three `vmagent` instances, where two `vmagent` instances scrape each target:
@@ -928,6 +934,29 @@ vmagent will generate the following persistent queue folders:
 2_0AAFDF53E314A72A
 ```
 
+### On-disk persistence and data processing order
+
+By default, vmagent processes data in FIFO order. If data has been written to the on-disk queue,
+it must be flushed to the remote storage before newly ingested data can be forwarded there.
+During long outages, vmagent may accumulate large amounts of data in the file-based queue,
+which can introduce a significant lag between the moment data is collected by vmagent and the
+moment it becomes visible at the remote storage.
+
+This behavior can be changed with the `-remoteWrite.inmemoryQueues` {{% available_from "v1.146.0" %}} command-line flag.
+When set to a non-zero value, vmagent starts the given number of additional workers,
+which send only recently ingested data from the in-memory queue, while the workers configured via `-remoteWrite.queues` drain the file-based backlog concurrently.
+This reduces the delivery lag for fresh samples after remote storage outages or slowdowns. The flag can be set individually per each `-remoteWrite.url`.
+
+Note that these workers are started in addition to the workers configured via `-remoteWrite.queues`, so the total number of concurrent connections to
+the remote storage becomes the sum of both flags. Take this into account if the remote storage limits the number of concurrent requests.
+
+This flag has the following possible limitations:
+
+* Samples may arrive at the remote storage out of order, since recent data can be delivered before the older backlogged data.
+  Do not use this option if the remote storage doesn't accept out-of-order samples.
+* Recent data isn't guaranteed to take the fast path: if the in-memory queue  is full,
+  newly ingested data is still written to the file-based queue and is delivered in FIFO order by the generic workers.
+
 ### Disabling On-disk persistence
 
 There are cases when it is better to disable on-disk persistence for pending data on the `vmagent` side:

docs/victoriametrics/vmagent_common_flags.md

@@ -74,6 +74,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/vmagent/ .
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmalert_common_flags.md

@@ -115,6 +115,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/vmalert/ .
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmauth_common_flags.md

@@ -59,6 +59,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/vmauth/ .
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmbackup.md

@@ -400,6 +400,8 @@ Run `vmbackup -help` in order to see all the available options:
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmbackupmanager.md

@@ -575,6 +575,8 @@ command-line flags:
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmgateway.md

@@ -496,6 +496,8 @@ Below is the list of configuration flags (it can be viewed by running `./vmgatew
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vminsert_common_flags.md

@@ -76,6 +76,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/cluster-victori
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmrestore.md

@@ -102,6 +102,8 @@ Run `vmrestore -help` in order to see all the available options:
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

docs/victoriametrics/vmselect_common_flags.md

@@ -75,6 +75,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/cluster-victori
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string
@@ -323,7 +325,7 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/cluster-victori
   -version
      Show VictoriaMetrics version
   -vmalert.proxyURL string
-     Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules
+     Optional URL for proxying requests to vmalert. For example, if -vmalert.proxyURL=http://vmalert:8880 , then alerting API requests such as /api/v1/rules from Grafana will be proxied to http://vmalert:8880/api/v1/rules . See https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#vmalert
   -vmstorageDialTimeout duration
      Timeout for establishing RPC connections from vmselect to vmstorage. See also -vmstorageUserTimeout (default 3s)
   -vmstorageUserTimeout duration

docs/victoriametrics/vmstorage_common_flags.md

@@ -68,6 +68,8 @@ See the docs at https://docs.victoriametrics.com/victoriametrics/cluster-victori
      Disable compression of HTTP responses to save CPU resources. By default, compression is enabled to save network bandwidth
   -http.header.csp string
      Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"
+  -http.header.disableServerHostname
+     Whether to disable 'X-Server-Hostname' header in HTTP responses
   -http.header.frameOptions string
      Value for 'X-Frame-Options' header
   -http.header.hsts string

go.mod

@@ -3,19 +3,19 @@ module github.com/VictoriaMetrics/VictoriaMetrics
 go 1.26.4
 
 require (
-	cloud.google.com/go/storage v1.62.1
-	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0
-	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1
-	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.4
-	github.com/VictoriaMetrics/VictoriaLogs v1.50.1-0.20260415124154-6b7a6357aec0
+	cloud.google.com/go/storage v1.62.3
+	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.22.0
+	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.14.0
+	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.8.0
+	github.com/VictoriaMetrics/VictoriaLogs v1.121.1-0.20260616132739-c901a1e31cb3
 	github.com/VictoriaMetrics/easyproto v1.2.0
 	github.com/VictoriaMetrics/fastcache v1.13.3
-	github.com/VictoriaMetrics/metrics v1.43.2
-	github.com/VictoriaMetrics/metricsql v0.87.0
-	github.com/aws/aws-sdk-go-v2 v1.41.5
-	github.com/aws/aws-sdk-go-v2/config v1.32.14
-	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.22.13
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.99.0
+	github.com/VictoriaMetrics/metrics v1.44.0
+	github.com/VictoriaMetrics/metricsql v0.87.1
+	github.com/aws/aws-sdk-go-v2 v1.42.0
+	github.com/aws/aws-sdk-go-v2/config v1.32.25
+	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.22.27
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.103.3
 	github.com/bmatcuk/doublestar/v4 v4.10.0
 	github.com/cespare/xxhash/v2 v2.3.0
 	github.com/cheggaaa/pb/v3 v3.1.7
@@ -24,9 +24,9 @@ require (
 	github.com/google/go-cmp v0.7.0
 	github.com/googleapis/gax-go/v2 v2.22.0
 	github.com/influxdata/influxdb v1.12.4
-	github.com/klauspost/compress v1.18.5
+	github.com/klauspost/compress v1.18.6
 	github.com/oklog/ulid/v2 v2.1.1
-	github.com/prometheus/prometheus v0.311.3
+	github.com/prometheus/prometheus v0.312.0
 	github.com/urfave/cli/v2 v2.27.7
 	github.com/valyala/fastjson v1.6.10
 	github.com/valyala/fastrand v1.1.0
@@ -34,46 +34,46 @@ require (
 	github.com/valyala/gozstd v1.24.0
 	github.com/valyala/histogram v1.2.0
 	github.com/valyala/quicktemplate v1.8.0
-	golang.org/x/net v0.55.0
+	golang.org/x/net v0.56.0
 	golang.org/x/oauth2 v0.36.0
-	golang.org/x/sys v0.45.0
-	google.golang.org/api v0.276.0
+	golang.org/x/sys v0.46.0
+	google.golang.org/api v0.284.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 
 require (
-	cel.dev/expr v0.25.1 // indirect
+	cel.dev/expr v0.25.2 // indirect
 	cloud.google.com/go v0.123.0 // indirect
 	cloud.google.com/go/auth v0.20.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
-	cloud.google.com/go/iam v1.9.0 // indirect
-	cloud.google.com/go/monitoring v1.27.0 // indirect
+	cloud.google.com/go/iam v1.11.0 // indirect
+	cloud.google.com/go/monitoring v1.29.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.12.0 // indirect
-	github.com/AzureAD/microsoft-authentication-library-for-go v1.7.1 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.32.0 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.56.0 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.56.0 // indirect
+	github.com/AzureAD/microsoft-authentication-library-for-go v1.7.2 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.33.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.57.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.57.0 // indirect
 	github.com/VividCortex/ewma v1.2.0 // indirect
 	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b // indirect
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.8 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.19.14 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.6 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.22 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.7 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.21 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.21 // indirect
-	github.com/aws/aws-sdk-go-v2/service/signin v1.0.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.30.15 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.19 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.41.10 // indirect
-	github.com/aws/smithy-go v1.24.3 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.13 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.19.24 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.29 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.29 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.29 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.30 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.12 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.22 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.29 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.29 // indirect
+	github.com/aws/aws-sdk-go-v2/service/signin v1.2.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.31.3 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.36.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.43.3 // indirect
+	github.com/aws/smithy-go v1.27.2 // indirect
 	github.com/bboreham/go-loser v0.0.0-20230920113527-fcc2c21820a3 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
@@ -82,8 +82,8 @@ require (
 	github.com/envoyproxy/go-control-plane/envoy v1.37.0 // indirect
 	github.com/envoyproxy/protoc-gen-validate v1.3.3 // indirect
 	github.com/fatih/color v1.19.0 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/fxamacker/cbor/v2 v2.9.1 // indirect
+	github.com/felixge/httpsnoop v1.1.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.2 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.4 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
@@ -92,89 +92,89 @@ require (
 	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.14 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.16 // indirect
 	github.com/grafana/regexp v0.0.0-20250905093917-f7b3be9d1853 // indirect
 	github.com/hashicorp/go-version v1.9.0 // indirect
 	github.com/jpillora/backoff v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/knadh/koanf/maps v0.1.2 // indirect
 	github.com/knadh/koanf/providers/confmap v1.0.0 // indirect
-	github.com/knadh/koanf/v2 v2.3.4 // indirect
+	github.com/knadh/koanf/v2 v2.3.5 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.21 // indirect
-	github.com/mattn/go-runewidth v0.0.23 // indirect
+	github.com/mattn/go-colorable v0.1.15 // indirect
+	github.com/mattn/go-isatty v0.0.22 // indirect
+	github.com/mattn/go-runewidth v0.0.24 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
-	github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics v0.150.0 // indirect
-	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.150.0 // indirect
-	github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor v0.150.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics v0.154.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.154.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor v0.154.0 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_golang v1.23.2 // indirect
-	github.com/prometheus/client_golang/exp v0.0.0-20260411065453-32d05ffab50a // indirect
+	github.com/prometheus/client_golang/exp v0.0.0-20260602051030-3537b20ac86b // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.67.5 // indirect
+	github.com/prometheus/common v0.68.1 // indirect
 	github.com/prometheus/otlptranslator v1.0.0 // indirect
 	github.com/prometheus/procfs v0.20.1 // indirect
 	github.com/prometheus/sigv4 v0.4.1 // indirect
-	github.com/puzpuzpuz/xsync/v4 v4.4.0 // indirect
+	github.com/puzpuzpuz/xsync/v4 v4.5.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/spiffe/go-spiffe/v2 v2.6.0 // indirect
+	github.com/spiffe/go-spiffe/v2 v2.7.0 // indirect
 	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/collector/component v1.56.0 // indirect
-	go.opentelemetry.io/collector/confmap v1.56.0 // indirect
-	go.opentelemetry.io/collector/confmap/xconfmap v0.150.0 // indirect
-	go.opentelemetry.io/collector/consumer v1.56.0 // indirect
-	go.opentelemetry.io/collector/featuregate v1.56.0 // indirect
-	go.opentelemetry.io/collector/internal/componentalias v0.150.0 // indirect
-	go.opentelemetry.io/collector/pdata v1.56.0 // indirect
-	go.opentelemetry.io/collector/pipeline v1.56.0 // indirect
-	go.opentelemetry.io/collector/processor v1.56.0 // indirect
-	go.opentelemetry.io/contrib/detectors/gcp v1.43.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.68.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.68.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 // indirect
-	go.opentelemetry.io/otel v1.43.0 // indirect
-	go.opentelemetry.io/otel/metric v1.43.0 // indirect
-	go.opentelemetry.io/otel/sdk v1.43.0 // indirect
-	go.opentelemetry.io/otel/sdk/metric v1.43.0 // indirect
-	go.opentelemetry.io/otel/trace v1.43.0 // indirect
+	go.opentelemetry.io/collector/component v1.60.0 // indirect
+	go.opentelemetry.io/collector/confmap v1.60.0 // indirect
+	go.opentelemetry.io/collector/confmap/xconfmap v0.154.0 // indirect
+	go.opentelemetry.io/collector/consumer v1.60.0 // indirect
+	go.opentelemetry.io/collector/featuregate v1.60.0 // indirect
+	go.opentelemetry.io/collector/internal/componentalias v0.154.0 // indirect
+	go.opentelemetry.io/collector/pdata v1.60.0 // indirect
+	go.opentelemetry.io/collector/pipeline v1.60.0 // indirect
+	go.opentelemetry.io/collector/processor v1.60.0 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.44.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.69.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.69.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0 // indirect
+	go.opentelemetry.io/otel v1.44.0 // indirect
+	go.opentelemetry.io/otel/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.44.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/trace v1.44.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.uber.org/goleak v1.3.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	go.uber.org/zap v1.27.1 // indirect
+	go.uber.org/zap v1.28.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.4 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/crypto v0.52.0 // indirect
-	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/term v0.43.0 // indirect
-	golang.org/x/text v0.37.0 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
+	golang.org/x/exp v0.0.0-20260611194520-c48552f49976 // indirect
+	golang.org/x/sync v0.21.0 // indirect
+	golang.org/x/term v0.44.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
-	google.golang.org/genproto v0.0.0-20260414002931-afd174a4e478 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20260414002931-afd174a4e478 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
-	google.golang.org/grpc v1.80.0 // indirect
-	google.golang.org/protobuf v1.36.11 // indirect
+	google.golang.org/genproto v0.0.0-20260615183401-62b3387ff324 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260615183401-62b3387ff324 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260615183401-62b3387ff324 // indirect
+	google.golang.org/grpc v1.81.1 // indirect
+	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/apimachinery v0.35.3 // indirect
-	k8s.io/client-go v0.35.3 // indirect
+	k8s.io/apimachinery v0.36.2 // indirect
+	k8s.io/client-go v0.36.2 // indirect
 	k8s.io/klog/v2 v2.140.0 // indirect
-	k8s.io/kube-openapi v0.0.0-20260414162039-ec9c827d403f // indirect
-	k8s.io/utils v0.0.0-20260319190234-28399d86e0b5 // indirect
+	k8s.io/kube-openapi v0.0.0-20260603220949-865597e52e25 // indirect
+	k8s.io/utils v0.0.0-20260507154919-ff6756f316d2 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect
-	sigs.k8s.io/structured-merge-diff/v6 v6.3.2 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.4.0 // indirect
 	sigs.k8s.io/yaml v1.6.0 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-cel.dev/expr v0.25.1 h1:1KrZg61W6TWSxuNZ37Xy49ps13NUovb66QLprthtwi4=
-cel.dev/expr v0.25.1/go.mod h1:hrXvqGP6G6gyx8UAHSHJ5RGk//1Oj5nXQ2NI02Nrsg4=
+cel.dev/expr v0.25.2 h1:K6j46C81hXtZQfuX60cVWQFBJahKSE2gfRbNuvr5bFs=
+cel.dev/expr v0.25.2/go.mod h1:hrXvqGP6G6gyx8UAHSHJ5RGk//1Oj5nXQ2NI02Nrsg4=
 cloud.google.com/go v0.123.0 h1:2NAUJwPR47q+E35uaJeYoNhuNEM9kM8SjgRgdeOJUSE=
 cloud.google.com/go v0.123.0/go.mod h1:xBoMV08QcqUGuPW65Qfm1o9Y4zKZBpGS+7bImXLTAZU=
 cloud.google.com/go/auth v0.20.0 h1:kXTssoVb4azsVDoUiF8KvxAqrsQcQtB53DcSgta74CA=
@@ -8,24 +8,24 @@ cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIi
 cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c=
 cloud.google.com/go/compute/metadata v0.9.0 h1:pDUj4QMoPejqq20dK0Pg2N4yG9zIkYGdBtwLoEkH9Zs=
 cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10=
-cloud.google.com/go/iam v1.9.0 h1:89wyjxT6DL4b5rk/Nk8eBC9DHqf+JiMstrn5IEYxFw4=
-cloud.google.com/go/iam v1.9.0/go.mod h1:KP+nKGugNJW4LcLx1uEZcq1ok5sQHFaQehQNl4QDgV4=
-cloud.google.com/go/logging v1.15.0 h1:6ooUEBNT6jdWh2b36+iuPn6b/R9qN/tHCbvGS5255gg=
-cloud.google.com/go/logging v1.15.0/go.mod h1:ZGKnpBaURITh+g/uom2VhbiFoFWvejcrHPDhxFtU/gI=
-cloud.google.com/go/longrunning v0.10.0 h1:4OWvp1BjCvoeSZTog3sRFDu6j4IrI9TI4/Y9N+8h25g=
-cloud.google.com/go/longrunning v0.10.0/go.mod h1:8nqFBPOO1U/XkhWl0I19AMZEphrHi73VNABIpKYaTwM=
-cloud.google.com/go/monitoring v1.27.0 h1:BhYwMqao+e5Nn7JtWMM9m6zRtKtVUK6kJWMizXChkLU=
-cloud.google.com/go/monitoring v1.27.0/go.mod h1:72NOVjJXHY/HBfoLT0+qlCZBT059+9VXLeAnL2PeeVM=
-cloud.google.com/go/storage v1.62.1 h1:Os0G3XbUbjZumkpDUf2Y0rLoXJTCF1kU2kWUujKYXD8=
-cloud.google.com/go/storage v1.62.1/go.mod h1:cpYz/kRVZ+UQAF1uHeea10/9ewcRbxGoGNKsS9daSXA=
-cloud.google.com/go/trace v1.13.0 h1:RfqsqPOiSCG8ql50UZt5F65KrVa1zbY9mJrO7xvZfbE=
-cloud.google.com/go/trace v1.13.0/go.mod h1:r+bdAn16dKLSV1G2D5v3e58IlQlizfxWrUfjx7kM7X0=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0 h1:fou+2+WFTib47nS+nz/ozhEBnvU96bKHy6LjRsY4E28=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0/go.mod h1:t76Ruy8AHvUAC8GfMWJMa0ElSbuIcO03NLpynfbgsPA=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1 h1:Hk5QBxZQC1jb2Fwj6mpzme37xbCDdNTxU7O9eb5+LB4=
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@@ -330,6 +336,10 @@ github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zx
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@@ -342,23 +352,23 @@ github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f h1:KUppIJq7/+
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@@ -366,22 +376,22 @@ github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRI
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@@ -390,10 +400,10 @@ github.com/scaleway/scaleway-sdk-go v1.0.0-beta.36 h1:ObX9hZmK+VmijreZO/8x9pQ8/P
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@@ -422,8 +432,8 @@ github.com/valyala/histogram v1.2.0 h1:wyYGAZZt3CpwUiIb9AU/Zbllg1llXyrtApRS815OL
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@@ -432,62 +442,64 @@ github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
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@@ -500,8 +512,8 @@ go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
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@@ -509,65 +521,65 @@ go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
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@@ -575,30 +587,30 @@ gopkg.in/evanphx/json-patch.v4 v4.13.0 h1:czT3CmqEaQ1aanPc5SdlgQrrEIb8w/wwCvWWnf
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-gopkg.in/ini.v1 v1.67.1/go.mod h1:x/cyOwCgZqOkJoDIJ3c1KNHMo10+nLGAhh+kn3Zizss=
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lib/backup/actions/restore.go

@@ -91,6 +91,11 @@ func (r *Restore) Run(ctx context.Context) error {
 	if err != nil {
 		return fmt.Errorf("cannot list src parts: %w", err)
 	}
+	for _, srcPart := range srcParts {
+		if !srcPart.IsLocalPathInsideDir(r.Dst.Dir) {
+			return fmt.Errorf("part file %s would be written outside storage directory %s", srcPart.Path, r.Dst.Dir)
+		}
+	}
 	logger.Infof("obtaining list of parts at %s", dst)
 	dstParts, err := dst.ListParts()
 	if err != nil {

lib/backup/common/part.go

@@ -120,6 +120,17 @@ func (p *Part) ParseFromRemotePath(remotePath string) bool {
 	return true
 }
 
+// IsLocalPathInsideDir returns true if the part's local path resolves inside dir.
+// It resolves ../../ sequences and prevents path traversal outside dir.
+func (p *Part) IsLocalPathInsideDir(dir string) bool {
+	dir = filepath.Clean(dir)
+	if dir == `/` {
+		return true
+	}
+
+	return strings.HasPrefix(p.LocalPath(dir), dir+string(filepath.Separator))
+}
+
 // MaxPartSize is the maximum size for each part.
 //
 // The MaxPartSize reduces bandwidth usage during retires on network errors

lib/backup/common/part_test.go

@@ -0,0 +1,54 @@
+package common
+
+import (
+	"testing"
+)
+
+func TestIsLocalPathInsideDir(t *testing.T) {
+	f := func(dir, path string, expected bool) {
+		t.Helper()
+		p := Part{Path: path}
+		if got := p.IsLocalPathInsideDir(dir); got != expected {
+			t.Fatalf("IsLocalPathInsideDir(%q, %q): got %v, want %v", dir, path, got, expected)
+		}
+	}
+
+	// normal path inside dir
+	f("/data/storage", "parts/segment1/data.bin", true)
+
+	// dir with trailing slash is normalized
+	f("/data/storage/", "parts/segment1/data.bin", true)
+
+	// deeply nested path
+	f("/data/storage", "a/b/c/d/e/file.dat", true)
+
+	// traversal that stays inside dir
+	f("/data/storage", "foo/../bar/file.dat", true)
+
+	// root dir allows any path
+	f("/", "any/path/here", true)
+
+	// root dir allows traversal attempts since nothing is outside /
+	f("/", "../outside/marker.txt", true)
+
+	// path with leading slash is treated as relative by filepath.Join and stays inside dir
+	f("/data/storage", "/outside/marker.txt", true)
+
+	// dir with .. components is normalized; path inside resolved dir
+	f("/data/storage/../foo", "parts/file.dat", true)
+
+	// dir with .. components is normalized; traversal outside resolved dir
+	f("/data/storage/../foo", "../storage/evil.txt", false)
+
+	// simple traversal
+	f("/data/storage", "../outside/marker.txt", false)
+
+	// traversal with trailing slash in dir
+	f("/data/storage/", "../outside/marker.txt", false)
+
+	// deep traversal
+	f("/data/storage", "a/../../outside/marker.txt", false)
+
+	// sibling directory whose name shares a prefix with dir
+	f("/data/storage", "../storagefoo/evil.txt", false)
+}

lib/backup/fslocal/fslocal.go

@@ -129,6 +129,10 @@ func (fs *FS) NewReadCloser(p common.Part) (io.ReadCloser, error) {
 // On platforms with preallocation, writes go to a .tmp file that must be
 // finalized with FinalizeFile.
 func (fs *FS) NewDirectWriteCloser(p common.Part) (io.WriteCloser, error) {
+	if !p.IsLocalPathInsideDir(fs.Dir) {
+		logger.Fatalf("BUG: part file %s would be written outside storage directory %s", p.Path, fs.Dir)
+	}
+
 	path := fs.writePath(p)
 	if err := fs.mkdirAll(path); err != nil {
 		return nil, err

lib/fs/dir_remover.go

@@ -179,6 +179,9 @@ func tryRemoveDir(dirPath string) bool {
 			// times simultaneously and properly close it, fs caching may still
 			// confuse NFS client.
 			if err := os.RemoveAll(dirEntryPath); err != nil {
+				if os.IsNotExist(err) {
+					return
+				}
 				if !isTemporaryNFSError(err) {
 					logger.Fatalf("FATAL: cannot remove %q: %s", dirEntryPath, err)
 				}
@@ -203,8 +206,9 @@ func tryRemoveDir(dirPath string) bool {
 
 	deleteFilePath := filepath.Join(dirPath, deleteDirFilename)
 	// Remove the deleteDirFilename file, since there are no other entries left in the directory.
-	MustRemovePath(deleteFilePath)
-
+	if !tryRemovePath(deleteFilePath) {
+		return false
+	}
 	// Sync the directory after the removing deletDirFilename file in order to make sure
 	// all the metadata files are removed at some exotic filesystems such as OSSFS2.
 	// See https://github.com/VictoriaMetrics/VictoriaLogs/issues/649
@@ -212,7 +216,9 @@ func tryRemoveDir(dirPath string) bool {
 	MustSyncPath(dirPath)
 
 	// Remove the dirPath itself
-	MustRemovePath(dirPath)
+	if !tryRemovePath(dirPath) {
+		return false
+	}
 
 	// Do not sync the parent directory for the dirPath - the caller can do this if needed.
 	// It is OK if the dirPath will remain undeleted after unclean shutdown - it will be deleted
@@ -221,6 +227,23 @@ func tryRemoveDir(dirPath string) bool {
 	return true
 }
 
+// tryRemovePath removes given path and returns true on success
+// or false if error is temporary NFS error
+func tryRemovePath(path string) bool {
+	if err := os.Remove(path); err != nil {
+		if os.IsNotExist(err) {
+			return true
+		}
+		if !isTemporaryNFSError(err) {
+			logger.Fatalf("FATAL: cannot remove %q: %s", path, err)
+		}
+		nfsDirRemoveFailedAttempts.Inc()
+		return false
+	}
+
+	return true
+}
+
 var (
 	dirRemoverWG               sync.WaitGroup
 	nfsDirRemoveFailedAttempts = metrics.NewCounter(`vm_nfs_dir_remove_failed_attempts_total`)

lib/httpserver/httpserver.go

@@ -64,9 +64,10 @@ var (
 	connTimeout                 = flag.Duration("http.connTimeout", 2*time.Minute, "Incoming connections to -httpListenAddr are closed after the configured timeout. "+
 		"This may help evenly spreading load among a cluster of services behind TCP-level load balancer. Zero value disables closing of incoming connections")
 
-	headerHSTS         = flag.String("http.header.hsts", "", "Value for 'Strict-Transport-Security' header, recommended: 'max-age=31536000; includeSubDomains'")
-	headerFrameOptions = flag.String("http.header.frameOptions", "", "Value for 'X-Frame-Options' header")
-	headerCSP          = flag.String("http.header.csp", "", `Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"`)
+	headerHSTS                  = flag.String("http.header.hsts", "", "Value for 'Strict-Transport-Security' header, recommended: 'max-age=31536000; includeSubDomains'")
+	headerFrameOptions          = flag.String("http.header.frameOptions", "", "Value for 'X-Frame-Options' header")
+	headerCSP                   = flag.String("http.header.csp", "", `Value for 'Content-Security-Policy' header, recommended: "default-src 'self'"`)
+	headerDisableServerHostname = flag.Bool("http.header.disableServerHostname", false, "Whether to disable 'X-Server-Hostname' header in HTTP responses")
 
 	disableCORS = flag.Bool("http.disableCORS", false, `Disable CORS for all origins (*)`)
 )
@@ -329,7 +330,9 @@ func handlerWrapper(w http.ResponseWriter, r *http.Request, rh RequestHandler) {
 	if *headerCSP != "" {
 		h.Add("Content-Security-Policy", *headerCSP)
 	}
-	h.Add("X-Server-Hostname", hostname)
+	if !*headerDisableServerHostname {
+		h.Add("X-Server-Hostname", hostname)
+	}
 	requestsTotal.Inc()
 	if whetherToCloseConn(r) {
 		connTimeoutClosedConns.Inc()
@@ -808,10 +811,20 @@ func LogError(req *http.Request, errStr string) {
 	logger.Errorf("uri: %s, remote address: %q: %s", uri, remoteAddr, errStr)
 }
 
+// tlsErrorSkipLogger must be passed as the out argument to log.New only.
+// It suppresses noisy TCP probe errors on TLS connections to avoid log pollution.
+//
+// This cannot be implemented in net.Listener because a TLS handshake may take seconds,
+// during which no other connections can be accepted. Therefor, the implementation inside net.Listener can lead to DoS.
+// Once a connection is passed to the conn serve goroutine, there is no direct access to the handshake logic, so this indirect
+// approach is used instead.
 type tlsErrorSkipLogger struct{}
 
+// Write filters out TLS handshake errors from health-check probes.
+// log.Logger guarantees that each complete message is delivered in a single Write call
+// and that calls are serialized, so we can safely inspect p for a "TLS handshake error".
+// See https://github.com/golang/go/blob/38e988efb4b8f5e73e887027f386a342c138b649/src/log/log.go#L53-L57
 func (*tlsErrorSkipLogger) Write(p []byte) (int, error) {
-	// skip common health check errors produced by Kubernetes and other tools
 	if bytes.Contains(p, []byte("TLS handshake error")) &&
 		(bytes.Contains(p, []byte("EOF")) || bytes.Contains(p, []byte("connection reset by peer"))) {
 		return len(p), nil

lib/httpserver/httpserver_test.go

@@ -228,4 +228,30 @@ func TestHandlerWrapper(t *testing.T) {
 	if got := h.Get("Content-Security-Policy"); got != cspHeader {
 		t.Fatalf("unexpected CSP header; got %q; want %q", got, cspHeader)
 	}
+	if got := h.Get("X-Server-Hostname"); got != hostname {
+		t.Fatalf("unexpected X-Server-Hostname header; got %q; want %q", got, hostname)
+	}
+}
+
+func TestHandlerWrapperDisableServerHostnameHeader(t *testing.T) {
+	origDisableServerHostname := *headerDisableServerHostname
+	*headerDisableServerHostname = true
+	defer func() {
+		*headerDisableServerHostname = origDisableServerHostname
+	}()
+
+	req, _ := http.NewRequest("GET", "/health", nil)
+
+	srv := &server{s: &http.Server{}}
+	w := &httptest.ResponseRecorder{}
+
+	handlerWrapper(w, req, func(w http.ResponseWriter, r *http.Request) bool {
+		return builtinRoutesHandler(srv, r, w, func(_ http.ResponseWriter, _ *http.Request) bool {
+			return true
+		})
+	})
+
+	if got := w.Header().Get("X-Server-Hostname"); got != "" {
+		t.Fatalf("unexpected X-Server-Hostname header; got %q; want empty value", got)
+	}
 }

lib/httputil/time_test.go

@@ -52,6 +52,9 @@ func TestGetTimeSuccess(t *testing.T) {
 	f("292277025-08-18T07:12:54.999999999Z", maxTimeMsecs)
 	f("1562529662.324", 1562529662324)
 	f("1223372036.855", 1223372036855)
+
+	// relative duration that resolves to a timestamp before 1970
+	f("-9223372036.854", minTimeMsecs)
 }
 
 func TestGetTimeError(t *testing.T) {
@@ -63,8 +66,8 @@ func TestGetTimeError(t *testing.T) {
 			t.Fatalf("unexpected error in NewRequest: %s", err)
 		}
 
-		if _, err := GetTime(r, "s", 123); err == nil {
-			t.Fatalf("expecting non-nil error in GetTime(%q)", s)
+		if msec, err := GetTime(r, "s", 123); err == nil {
+			t.Fatalf("expecting non-nil error in GetTime(%q); got %d", s, msec)
 		}
 	}
 
@@ -84,7 +87,6 @@ func TestGetTimeError(t *testing.T) {
 	f("123md")
 	f("-12.3md")
 
-	// relative duration that resolves to a timestamp before 1970
-	f("-9223372036.854")
+	// relative duration outside the allowed range
 	f("-9223372036.855")
 }

lib/mergeset/table.go

@@ -48,6 +48,12 @@ const maxPartSize = 400e9
 // The interval for flushing buffered data to parts, so it becomes visible to search.
 const pendingItemsFlushInterval = time.Second
 
+// The default interval for calling flushCallback when there is pending data to flush.
+//
+// It is set relatively high in order to improve the effectiveness of caches reset by flushCallback.
+// It is used when the flushCallbackInterval arg at MustOpenTable is set to zero.
+const defaultFlushCallbackInterval = 10 * time.Second
+
 // maxItemsPerCachedPart is the maximum items per created part by the merge,
 // which must be cached in the OS page cache.
 //
@@ -88,6 +94,7 @@ type Table struct {
 	flushInterval time.Duration
 
 	flushCallback         func()
+	flushCallbackInterval time.Duration
 	needFlushCallbackCall atomic.Bool
 
 	prepareBlock PrepareBlockCallback
@@ -332,11 +339,14 @@ func (pw *partWrapper) decRef() {
 // Optional flushCallback is called every time new data batch is flushed
 // to the underlying storage and becomes visible to search.
 //
+// The flushCallbackInterval is how often flushCallback is invoked when there is
+// pending data to flush. If it is set to zero, then defaultFlushCallbackInterval is used.
+//
 // Optional prepareBlock is called during merge before flushing the prepared block
 // to persistent storage.
 //
 // The table is created if it doesn't exist yet.
-func MustOpenTable(path string, flushInterval time.Duration, flushCallback func(), prepareBlock PrepareBlockCallback, isReadOnly *atomic.Bool) *Table {
+func MustOpenTable(path string, flushInterval time.Duration, flushCallback func(), flushCallbackInterval time.Duration, prepareBlock PrepareBlockCallback, isReadOnly *atomic.Bool) *Table {
 	path = filepath.Clean(path)
 
 	if flushInterval < pendingItemsFlushInterval {
@@ -345,6 +355,10 @@ func MustOpenTable(path string, flushInterval time.Duration, flushCallback func(
 		flushInterval = pendingItemsFlushInterval
 	}
 
+	if flushCallbackInterval <= 0 {
+		flushCallbackInterval = defaultFlushCallbackInterval
+	}
+
 	// Create a directory at the path if it doesn't exist yet.
 	fs.MustMkdirIfNotExist(path)
 
@@ -355,14 +369,15 @@ func MustOpenTable(path string, flushInterval time.Duration, flushCallback func(
 	fs.MustSyncPathAndParentDir(path)
 
 	tb := &Table{
-		path:                 path,
-		flushInterval:        flushInterval,
-		flushCallback:        flushCallback,
-		prepareBlock:         prepareBlock,
-		isReadOnly:           isReadOnly,
-		fileParts:            pws,
-		inmemoryPartsLimitCh: make(chan struct{}, maxInmemoryParts),
-		stopCh:               make(chan struct{}),
+		path:                  path,
+		flushInterval:         flushInterval,
+		flushCallback:         flushCallback,
+		flushCallbackInterval: flushCallbackInterval,
+		prepareBlock:          prepareBlock,
+		isReadOnly:            isReadOnly,
+		fileParts:             pws,
+		inmemoryPartsLimitCh:  make(chan struct{}, maxInmemoryParts),
+		stopCh:                make(chan struct{}),
 	}
 	tb.mergeIdx.Store(uint64(time.Now().UnixNano()))
 	tb.rawItems.init()
@@ -429,9 +444,9 @@ func (tb *Table) startFlushCallbackWorker() {
 	}
 
 	tb.wg.Go(func() {
-		// call flushCallback once per 10 seconds in order to improve the effectiveness of caches,
-		// which are reset by the flushCallback.
-		d := timeutil.AddJitterToDuration(time.Second * 10)
+		// call flushCallback at flushCallbackInterval in order to improve the effectiveness
+		// of caches, which are reset by the flushCallback.
+		d := timeutil.AddJitterToDuration(tb.flushCallbackInterval)
 		tc := time.NewTicker(d)
 		for {
 			select {

lib/mergeset/table_search_test.go

@@ -40,7 +40,7 @@ func TestTableSearchSerial(t *testing.T) {
 	func() {
 		// Re-open the table and verify the search works.
 		var isReadOnly atomic.Bool
-		tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+		tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 		defer tb.MustClose()
 		if err := testTableSearchSerial(tb, items); err != nil {
 			t.Fatalf("unexpected error: %s", err)
@@ -70,7 +70,7 @@ func TestTableSearchConcurrent(t *testing.T) {
 	// Re-open the table and verify the search works.
 	func() {
 		var isReadOnly atomic.Bool
-		tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+		tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 		defer tb.MustClose()
 		if err := testTableSearchConcurrent(tb, items); err != nil {
 			t.Fatalf("unexpected error: %s", err)
@@ -144,7 +144,7 @@ func newTestTable(r *rand.Rand, path string, itemsCount int) (*Table, []string,
 		flushes.Add(1)
 	}
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, flushCallback, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, flushCallback, 0, nil, &isReadOnly)
 	items := make([]string, itemsCount)
 	for i := range itemsCount {
 		item := fmt.Sprintf("%d:%d", r.Intn(1e9), i)

lib/mergeset/table_search_timing_test.go

@@ -33,7 +33,7 @@ func benchmarkTableSearch(b *testing.B, itemsCount int) {
 	// Force finishing pending merges
 	tb.MustClose()
 	var isReadOnly atomic.Bool
-	tb = MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb = MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 	defer tb.MustClose()
 
 	keys := make([][]byte, len(items))
@@ -94,7 +94,7 @@ func benchmarkTableSearchKeysExt(b *testing.B, tb *Table, keys [][]byte, stripSu
 				}
 				ts.Seek(searchKey)
 				if !ts.NextItem() {
-					panic(fmt.Errorf("BUG: NextItem must return true for searchKeys[%d]=%q; err=%v", i, searchKey, ts.Error()))
+					panic(fmt.Errorf("BUG: NextItem must return true for searchKeys[%d]=%q; err=%w", i, searchKey, ts.Error()))
 				}
 				if !bytes.HasPrefix(ts.Item, searchKey) {
 					panic(fmt.Errorf("BUG: unexpected item found for searchKey[%d]=%q; got %q; want %q", i, searchKey, ts.Item, key))

lib/mergeset/table_test.go

@@ -18,14 +18,14 @@ func TestTableOpenClose(t *testing.T) {
 
 	// Create a new table
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 
 	// Close it
 	tb.MustClose()
 
 	// Re-open created table multiple times.
 	for range 4 {
-		tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+		tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 		tb.MustClose()
 	}
 }
@@ -35,7 +35,7 @@ func TestTableAddItemsTooLongItem(t *testing.T) {
 	fs.MustRemoveDir(path)
 
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 	tb.AddItems([][]byte{make([]byte, maxInmemoryBlockSize+1)})
 	tb.MustClose()
 	fs.MustRemoveDir(path)
@@ -52,7 +52,7 @@ func TestTableAddItemsSerial(t *testing.T) {
 		flushes.Add(1)
 	}
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, flushCallback, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, flushCallback, 0, nil, &isReadOnly)
 
 	const itemsCount = 10e3
 	testAddItemsSerial(r, tb, itemsCount)
@@ -75,7 +75,7 @@ func TestTableAddItemsSerial(t *testing.T) {
 	testReopenTable(t, path, itemsCount)
 
 	// Add more items in order to verify merge between inmemory parts and file-based parts.
-	tb = MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb = MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 	const moreItemsCount = itemsCount * 3
 	testAddItemsSerial(r, tb, moreItemsCount)
 	tb.MustClose()
@@ -99,7 +99,7 @@ func TestTableCreateSnapshotAt(t *testing.T) {
 	fs.MustRemoveDir(path)
 
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 
 	// Write a lot of items into the table, so background merges would start.
 	const itemsCount = 3e5
@@ -111,7 +111,7 @@ func TestTableCreateSnapshotAt(t *testing.T) {
 	// Close and open the table in order to flush all the data to disk before creating snapshots.
 	// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4272#issuecomment-1550221840
 	tb.MustClose()
-	tb = MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb = MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 
 	// Create multiple snapshots.
 	snapshot1 := path + "-test-snapshot1"
@@ -121,8 +121,8 @@ func TestTableCreateSnapshotAt(t *testing.T) {
 	tb.MustCreateSnapshotAt(snapshot2)
 
 	// Verify snapshots contain all the data.
-	tb1 := MustOpenTable(snapshot1, 0, nil, nil, &isReadOnly)
-	tb2 := MustOpenTable(snapshot2, 0, nil, nil, &isReadOnly)
+	tb1 := MustOpenTable(snapshot1, 0, nil, 0, nil, &isReadOnly)
+	tb2 := MustOpenTable(snapshot2, 0, nil, 0, nil, &isReadOnly)
 
 	var ts, ts1, ts2 TableSearch
 	ts.Init(tb, false)
@@ -197,7 +197,7 @@ func TestTableAddItemsConcurrentStress(t *testing.T) {
 	}
 
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, flushCallback, prepareBlock, &isReadOnly)
+	tb := MustOpenTable(path, 0, flushCallback, 0, prepareBlock, &isReadOnly)
 
 	testAddItems(tb)
 
@@ -232,7 +232,7 @@ func TestTableAddItemsConcurrent(t *testing.T) {
 		return data, items
 	}
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, flushCallback, prepareBlock, &isReadOnly)
+	tb := MustOpenTable(path, 0, flushCallback, 0, prepareBlock, &isReadOnly)
 
 	const itemsCount = 10e3
 	testAddItemsConcurrent(tb, itemsCount)
@@ -255,7 +255,7 @@ func TestTableAddItemsConcurrent(t *testing.T) {
 	testReopenTable(t, path, itemsCount)
 
 	// Add more items in order to verify merge between inmemory parts and file-based parts.
-	tb = MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb = MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 	const moreItemsCount = itemsCount * 3
 	testAddItemsConcurrent(tb, moreItemsCount)
 	tb.MustClose()
@@ -292,7 +292,7 @@ func testReopenTable(t *testing.T, path string, itemsCount int) {
 
 	for range 10 {
 		var isReadOnly atomic.Bool
-		tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+		tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 		var m TableMetrics
 		tb.UpdateMetrics(&m)
 		if n := m.TotalItemsCount(); n != uint64(itemsCount) {
@@ -308,7 +308,7 @@ func TestTableMustMergeInmemoryPartsFinal_pwsRefCount(t *testing.T) {
 	defer fs.MustRemoveDir(path)
 
 	var isReadOnly atomic.Bool
-	tb := MustOpenTable(path, 0, nil, nil, &isReadOnly)
+	tb := MustOpenTable(path, 0, nil, 0, nil, &isReadOnly)
 	defer tb.MustClose()
 
 	generatePartWrappers := func(n int) []*partWrapper {

lib/persistentqueue/fastqueue.go

@@ -26,6 +26,8 @@ type FastQueue struct {
 	// isPQDisabled is set to true when pq is disabled.
 	isPQDisabled bool
 
+	prioritizeInMemoryData bool
+
 	// pq is file-based queue
 	pq *queue
 
@@ -39,6 +41,31 @@ type FastQueue struct {
 	stopDeadline uint64
 }
 
+// OpenFastQueueOpts defines options for FastQueue
+type OpenFastQueueOpts struct {
+	// MaxInmemoryBlocks defines amount of blocks to hold in memory before falling back to file-based persistence.
+	MaxInmemoryBlocks int
+	// MaxPendingBytes limits file-based size of the queue.
+	// If MaxPendingBytes is 0, then the queue size is unlimited.
+	// The oldest data is dropped when the queue
+	// reaches MaxPendingSize.
+	MaxPendingBytes int64
+	// IsPQDisabled defines whether file-based queue could be used.
+	// If it is set to true, then write requests that exceed in-memory buffer capacity are rejected.
+	// in-memory queue part can be stored on disk during graceful shutdown.
+	IsPQDisabled bool
+	// PrioritizeInMemoryData instructs FastQueue to write data into the in-memory queue
+	// even if the file-based queue is not empty.
+	// This is useful when data order doesn't matter and getting the most recent data
+	// as fast as possible is more important.
+	PrioritizeInmemoryData bool
+}
+
+// MustOpenFastQueueWithOpts opens persistent queue at the given path with given opts
+func MustOpenFastQueueWithOpts(path, name string, opts OpenFastQueueOpts) *FastQueue {
+	return mustOpenFastQueue(path, name, opts)
+}
+
 // MustOpenFastQueue opens persistent queue at the given path.
 //
 // It holds up to maxInmemoryBlocks in memory before falling back to file-based persistence.
@@ -49,11 +76,22 @@ type FastQueue struct {
 // if isPQDisabled is set to true, then write requests that exceed in-memory buffer capacity are rejected.
 // in-memory queue part can be stored on disk during graceful shutdown.
 func MustOpenFastQueue(path, name string, maxInmemoryBlocks int, maxPendingBytes int64, isPQDisabled bool) *FastQueue {
+	opts := OpenFastQueueOpts{
+		MaxInmemoryBlocks: maxInmemoryBlocks,
+		MaxPendingBytes:   maxPendingBytes,
+		IsPQDisabled:      isPQDisabled,
+	}
+	return mustOpenFastQueue(path, name, opts)
+}
+func mustOpenFastQueue(path, name string, opts OpenFastQueueOpts) *FastQueue {
+	maxPendingBytes := opts.MaxPendingBytes
+	isPQDisabled := opts.IsPQDisabled
 	pq := mustOpen(path, name, maxPendingBytes)
 	fq := &FastQueue{
-		pq:           pq,
-		isPQDisabled: isPQDisabled,
-		ch:           make(chan *bytesutil.ByteBuffer, maxInmemoryBlocks),
+		pq:                     pq,
+		isPQDisabled:           isPQDisabled,
+		prioritizeInMemoryData: opts.PrioritizeInmemoryData,
+		ch:                     make(chan *bytesutil.ByteBuffer, opts.MaxInmemoryBlocks),
 	}
 	fq.cond.L = &fq.mu
 	fq.lastInmemoryBlockReadTime = fasttime.UnixTimestamp()
@@ -81,7 +119,7 @@ func MustOpenFastQueue(path, name string, maxInmemoryBlocks int, maxPendingBytes
 	if isPQDisabled {
 		persistenceStatus = "disabled"
 	}
-	logger.Infof("opened fast queue at %q with maxInmemoryBlocks=%d, it contains %d pending bytes, persistence is %s", path, maxInmemoryBlocks, pendingBytes, persistenceStatus)
+	logger.Infof("opened fast queue at %q with maxInmemoryBlocks=%d, it contains %d pending bytes, persistence is %s", path, opts.MaxInmemoryBlocks, pendingBytes, persistenceStatus)
 	return fq
 }
 
@@ -97,7 +135,7 @@ func (fq *FastQueue) IsWriteBlocked() bool {
 	}
 	fq.mu.Lock()
 	defer fq.mu.Unlock()
-	return len(fq.ch) == cap(fq.ch) || fq.pq.GetPendingBytes() > 0
+	return len(fq.ch) == cap(fq.ch) || (fq.pq.GetPendingBytes() > 0 && !fq.prioritizeInMemoryData)
 }
 
 // UnblockAllReaders unblocks all the readers.
@@ -193,19 +231,24 @@ func (fq *FastQueue) tryWriteBlock(block []byte, ignoreDisabledPQ bool) bool {
 	defer fq.mu.Unlock()
 
 	isPQWriteAllowed := !fq.isPQDisabled || ignoreDisabledPQ
-
-	fq.flushInmemoryBlocksToFileIfNeededLocked()
-	if n := fq.pq.GetPendingBytes(); n > 0 {
-		// The file-based queue isn't drained yet. This means that in-memory queue cannot be used yet.
-		// So put the block to file-based queue.
-		if len(fq.ch) > 0 {
-			logger.Panicf("BUG: the in-memory queue must be empty when the file-based queue is non-empty; it contains %d pending bytes", n)
+	if !isPQWriteAllowed && fq.pq.GetPendingBytes() > 0 {
+		// fast path: there is pending data at file-based queue,
+		// it must be drained before in-memory queue could be used.
+		// File-based queue could be non-empty after vmagent restart
+		// and vmagent couldn't flush in-memory queue during shutdown.
+		return false
+	}
+	if !fq.prioritizeInMemoryData {
+		fq.flushInmemoryBlocksToFileIfNeededLocked()
+		if n := fq.pq.GetPendingBytes(); n > 0 {
+			// The file-based queue isn't drained yet. This means that in-memory queue cannot be used yet.
+			// So put the block to file-based queue.
+			if len(fq.ch) > 0 {
+				logger.Panicf("BUG: the in-memory queue must be empty when the file-based queue is non-empty; it contains %d pending bytes", n)
+			}
+			fq.pq.MustWriteBlock(block)
+			return true
 		}
-		if !isPQWriteAllowed {
-			return false
-		}
-		fq.pq.MustWriteBlock(block)
-		return true
 	}
 	if len(fq.ch) == cap(fq.ch) {
 		// There is no space left in the in-memory queue. Put the data to file-based queue.
@@ -216,7 +259,7 @@ func (fq *FastQueue) tryWriteBlock(block []byte, ignoreDisabledPQ bool) bool {
 		fq.pq.MustWriteBlock(block)
 		return true
 	}
-	// Fast path - put the block to in-memory queue.
+
 	bb := blockBufPool.Get()
 	bb.B = append(bb.B[:0], block...)
 	fq.ch <- bb
@@ -229,12 +272,41 @@ func (fq *FastQueue) tryWriteBlock(block []byte, ignoreDisabledPQ bool) bool {
 }
 
 // MustReadBlock reads the next block from fq into dst and returns it.
-// It first reads from the in-memory queue, then checks file-based queue.
+// It first reads from the file-based queue, then checks in-memory queue.
 // It blocks until a block is available or the stop deadline is exceeded, in which case it returns (dst, false).
 func (fq *FastQueue) MustReadBlock(dst []byte) ([]byte, bool) {
 	fq.mu.Lock()
 	defer fq.mu.Unlock()
 
+	for {
+		if fq.stopDeadline > 0 && fasttime.UnixTimestamp() > fq.stopDeadline {
+			return dst, false
+		}
+		if n := fq.pq.GetPendingBytes(); n > 0 {
+			data, ok := fq.pq.MustReadBlockNonblocking(dst)
+			if ok {
+				return data, true
+			}
+			dst = data
+		}
+		if len(fq.ch) > 0 {
+			return fq.mustReadInMemoryBlockLocked(dst), true
+		}
+		if fq.stopDeadline > 0 {
+			return dst, false
+		}
+		// There are no blocks. Wait for new block.
+		fq.pq.ResetIfEmpty()
+		fq.cond.Wait()
+	}
+}
+
+// MustReadInMemoryBlockBlocking reads the next block from the in-memory queue into dst and returns it.
+// It blocks until a block is available or the stop deadline is exceeded, in which case it returns (dst, false).
+func (fq *FastQueue) MustReadInMemoryBlockBlocking(dst []byte) ([]byte, bool) {
+	fq.mu.Lock()
+	defer fq.mu.Unlock()
+
 	for {
 		if fq.stopDeadline > 0 && fasttime.UnixTimestamp() > fq.stopDeadline {
 			return dst, false
@@ -242,19 +314,10 @@ func (fq *FastQueue) MustReadBlock(dst []byte) ([]byte, bool) {
 		if len(fq.ch) > 0 {
 			return fq.mustReadInMemoryBlockLocked(dst), true
 		}
-		if n := fq.pq.GetPendingBytes(); n > 0 {
-			data, ok := fq.pq.MustReadBlockNonblocking(dst)
-			if ok {
-				return data, true
-			}
-			dst = data
-			continue
-		}
 		if fq.stopDeadline > 0 {
 			return dst, false
 		}
 		// There are no blocks. Wait for new block.
-		fq.pq.ResetIfEmpty()
 		fq.cond.Wait()
 	}
 }
@@ -277,9 +340,6 @@ func (fq *FastQueue) mustReadInMemoryBlockLocked(dst []byte) []byte {
 	if len(fq.ch) == 0 {
 		logger.Panicf("BUG: the function must not be called when in-memory queue is empty. Caller should verify the queue len upfront")
 	}
-	if n := fq.pq.GetPendingBytes(); n > 0 {
-		logger.Panicf("BUG: the file-based queue must be empty when the in-memory queue is non-empty; it contains %d pending bytes", n)
-	}
 	bb := <-fq.ch
 	fq.pendingInmemoryBytes -= uint64(len(bb.B))
 	fq.lastInmemoryBlockReadTime = fasttime.UnixTimestamp()

lib/persistentqueue/fastqueue_test.go

@@ -364,3 +364,64 @@ func TestFastQueueWriteReadWithIgnoreDisabledPQ(t *testing.T) {
 	fq.MustClose()
 	fs.MustRemoveDir(path)
 }
+
+func TestFastQueueWriteReadWithPrioritizeInmemory(t *testing.T) {
+	path := "fast-queue-write-read-inmemory-disabled-pq-force-write"
+	fs.MustRemoveDir(path)
+
+	capacity := 20
+	opts := OpenFastQueueOpts{
+		MaxInmemoryBlocks:      capacity,
+		PrioritizeInmemoryData: true,
+	}
+	fq := MustOpenFastQueueWithOpts(path, "foobar", opts)
+	if n := fq.GetInmemoryQueueLen(); n != 0 {
+		t.Fatalf("unexpected non-zero inmemory queue size:  %d", n)
+	}
+	var blocks []string
+	for i := range capacity {
+		block := fmt.Sprintf("block %d", i)
+		if !fq.TryWriteBlock([]byte(block)) {
+			t.Fatalf("TryWriteBlock must return true in this context")
+		}
+		blocks = append(blocks, block)
+	}
+	if n := fq.GetInmemoryQueueLen(); n != capacity {
+		t.Fatalf("unexpected non-zero inmemory queue size:  %d: %d", n, capacity)
+	}
+	for i := range capacity {
+		block := fmt.Sprintf("block %d-%d", i, i)
+		if !fq.TryWriteBlock([]byte(block)) {
+			t.Fatalf("TryWriteBlock must return true in this context")
+		}
+		blocks = append(blocks, block)
+	}
+
+	// in case of capacity exceed last element is written into file-based queue
+	if n := fq.GetInmemoryQueueLen(); n != capacity-1 {
+		t.Fatalf("unexpected non-zero inmemory queue size:  %d: %d", n, capacity)
+	}
+
+	// make sure that recently ingested elemements returned first
+	for idx := capacity + 1; idx < capacity*2; idx++ {
+		buf, ok := fq.MustReadInMemoryBlockBlocking(nil)
+		if !ok {
+			t.Fatalf("unexpected ok=false")
+		}
+		if string(buf) != blocks[idx] {
+			t.Fatalf("unexpected block read; got %q; want %q: %d", buf, blocks[idx], idx)
+		}
+	}
+	blocks = blocks[:capacity+1]
+	for _, block := range blocks {
+		buf, ok := fq.MustReadBlock(nil)
+		if !ok {
+			t.Fatalf("unexpected ok=false")
+		}
+		if string(buf) != block {
+			t.Fatalf("unexpected block read; got %q; want %q", buf, block)
+		}
+	}
+	fq.MustClose()
+	fs.MustRemoveDir(path)
+}

lib/promrelabel/if_expression.go

@@ -50,6 +50,17 @@ func (ie *IfExpression) Parse(s string) error {
 	return nil
 }
 
+// ParseFromMetricExpr parses if from given MetricExpr
+func (ie *IfExpression) ParseFromMetricExpr(me *metricsql.MetricExpr) error {
+	var ieLocal ifExpression
+	if err := ieLocal.parseFromMetricExpr(me); err != nil {
+		return err
+	}
+
+	ie.ies = []*ifExpression{&ieLocal}
+	return nil
+}
+
 // UnmarshalJSON unmarshals ie from JSON data.
 func (ie *IfExpression) UnmarshalJSON(data []byte) error {
 	var v any
@@ -182,6 +193,16 @@ func (ie *ifExpression) Parse(s string) error {
 	return nil
 }
 
+func (ie *ifExpression) parseFromMetricExpr(me *metricsql.MetricExpr) error {
+	lfss, err := metricExprToLabelFilterss(me)
+	if err != nil {
+		return fmt.Errorf("cannot parse series selector: %w", err)
+	}
+	ie.s = string(me.AppendString(nil))
+	ie.lfss = lfss
+	return nil
+}
+
 // UnmarshalJSON unmarshals ie from JSON data.
 func (ie *ifExpression) UnmarshalJSON(data []byte) error {
 	var s string

lib/promscrape/config.go

@@ -76,6 +76,9 @@ var (
 		"Every %d occurrence in the template is substituted with -promscrape.cluster.memberNum at urls to vmagent instances responsible for scraping the given target "+
 		"at /service-discovery page. For example -promscrape.cluster.memberURLTemplate='http://vmagent-%d:8429/targets'. "+
 		"See https://docs.victoriametrics.com/victoriametrics/vmagent/#scraping-big-number-of-targets for more details")
+	clusterShardByLabels = flagutil.NewArrayString("promscrape.cluster.shardByLabels", "Optional list of target labels, which will be used for sharding targets among cluster members "+
+		"if -promscrape.cluster.membersCount is greater than 1. If none of the specified labels are found in a target, then all the target labels will be used for sharding. "+
+		"See https://docs.victoriametrics.com/victoriametrics/vmagent/#scraping-big-number-of-targets for more info")
 	clusterReplicationFactor = flag.Int("promscrape.cluster.replicationFactor", 1, "The number of members in the cluster, which scrape the same targets. "+
 		"If the replication factor is greater than 1, then the deduplication must be enabled at remote storage side. "+
 		"See https://docs.victoriametrics.com/victoriametrics/vmagent/#scraping-big-number-of-targets for more info")
@@ -86,7 +89,10 @@ var (
 		"Bigger uncompressed responses are rejected. See also max_scrape_size option at https://docs.victoriametrics.com/victoriametrics/sd_configs/#scrape_configs")
 )
 
-var clusterMemberID int
+var (
+	clusterMemberID            int
+	clusterShardByLabelsSorted []string
+)
 
 func mustInitClusterMemberID() {
 	s := *clusterMemberNum
@@ -110,6 +116,15 @@ func mustInitClusterMemberID() {
 	clusterMemberID = n
 }
 
+func initClusterShardByLabels() {
+	if len(*clusterShardByLabels) == 0 {
+		clusterShardByLabelsSorted = nil
+		return
+	}
+	clusterShardByLabelsSorted = slices.Clone(*clusterShardByLabels)
+	slices.Sort(clusterShardByLabelsSorted)
+}
+
 // Config represents essential parts from Prometheus config defined at https://prometheus.io/docs/prometheus/latest/configuration/configuration/
 type Config struct {
 	Global            GlobalConfig    `yaml:"global,omitempty"`
@@ -1138,12 +1153,28 @@ func (stc *StaticConfig) appendScrapeWork(dst []*ScrapeWork, swc *scrapeWorkConf
 }
 
 func appendScrapeWorkKey(dst []byte, labels *promutil.Labels) []byte {
-	for _, label := range labels.GetLabels() {
-		// Do not use strconv.AppendQuote, since it is slow according to CPU profile.
-		dst = append(dst, label.Name...)
-		dst = append(dst, '=')
-		dst = append(dst, label.Value...)
-		dst = append(dst, ',')
+	originalDstLen := len(dst)
+	for _, targetLabelName := range clusterShardByLabelsSorted {
+		for _, label := range labels.GetLabels() {
+			if label.Name == targetLabelName {
+				// Do not use strconv.AppendQuote, since it is slow according to CPU profile.
+				dst = append(dst, label.Name...)
+				dst = append(dst, '=')
+				dst = append(dst, label.Value...)
+				dst = append(dst, ',')
+				break
+			}
+		}
+	}
+	// Use all labels to compute the key if `promscrape.cluster.shardByLabels` is not configured
+	if len(dst) == originalDstLen {
+		for _, label := range labels.GetLabels() {
+			dst = append(dst, label.Name...)
+			dst = append(dst, '=')
+			dst = append(dst, label.Value...)
+			dst = append(dst, ',')
+		}
+		return dst
 	}
 	return dst
 }

lib/promscrape/config_test.go

@@ -148,6 +148,77 @@ func TestGetClusterMemberNumsForScrapeWork(t *testing.T) {
 	f("foo", 3, 2, []int{2, 0})
 }
 
+func TestAppendScrapeWorkKeyShardByLabels(t *testing.T) {
+	f := func(labels map[string]string, shardByLabels []string, expectedKey string) {
+		t.Helper()
+		originValue := *clusterShardByLabels
+		*clusterShardByLabels = shardByLabels
+		defer func() {
+			*clusterShardByLabels = originValue
+		}()
+		initClusterShardByLabels()
+		outputKey := string(appendScrapeWorkKey(nil, promutil.NewLabelsFromMap(labels)))
+		if expectedKey != outputKey {
+			t.Fatalf("unexpected sharding key:%q for target labels:%v with shardByLabels=%q, expect: %q",
+				outputKey, labels, shardByLabels, expectedKey)
+		}
+	}
+
+	// didn't specify -promscrape.cluster.shardByLabels, so all labels will be used for sharding
+	f(
+		map[string]string{
+			"a": "aa",
+			"b": "bb",
+			"c": "cc",
+			"d": "dd"},
+		[]string{},
+		"a=aa,b=bb,c=cc,d=dd,",
+	)
+
+	// match all labels in -promscrape.cluster.shardByLabels, so label "a" and "c" will be used for sharding
+	f(
+		map[string]string{
+			"a": "aa",
+			"b": "bb",
+			"c": "cc",
+			"d": "dd"},
+		[]string{"a", "c"},
+		"a=aa,c=cc,",
+	)
+
+	// match all labels in -promscrape.cluster.shardByLabels, so label "a" and "c" will be used for sharding even if they're not in order in -promscrape.cluster.shardByLabels.
+	f(
+		map[string]string{
+			"a": "aa",
+			"b": "bb",
+			"c": "cc",
+			"d": "dd"},
+		[]string{"c", "a"},
+		"a=aa,c=cc,",
+	)
+
+	// match part of labels in -promscrape.cluster.shardByLabels, label "a" and "c" will be used for sharding
+	f(
+		map[string]string{
+			"a": "aa",
+			"c": "cc",
+			"d": "dd"},
+
+		[]string{"a", "b", "c"},
+		"a=aa,c=cc,",
+	)
+
+	// none of labels in -promscrape.cluster.shardByLabels is matched, so all labels will be used for sharding
+	f(
+		map[string]string{
+			"d": "dd",
+			"e": "ee"},
+		[]string{"a", "b", "c"},
+		"d=dd,e=ee,",
+	)
+
+}
+
 func TestLoadStaticConfigs(t *testing.T) {
 	scs, err := loadStaticConfigs("testdata/file_sd.json")
 	if err != nil {

lib/promscrape/scraper.go

@@ -66,6 +66,7 @@ func CheckConfig() error {
 // Scraped data is passed to pushData.
 func Init(pushData func(at *auth.Token, wr *prompb.WriteRequest)) {
 	mustInitClusterMemberID()
+	initClusterShardByLabels()
 	globalStopChan = make(chan struct{})
 	scraperWG.Go(func() {
 		runScraper(*promscrapeConfigFile, pushData, globalStopChan)
@@ -155,9 +156,22 @@ func runScraper(configFile string, pushData func(at *auth.Token, wr *prompb.Writ
 		tickerCh = ticker.C
 		defer ticker.Stop()
 	}
+	stop := func() {
+		cfg.mustStop()
+		logger.Infof("stopping Prometheus scrapers")
+		startTime := time.Now()
+		scs.stop()
+		logger.Infof("stopped Prometheus scrapers in %.3f seconds", time.Since(startTime).Seconds())
+	}
 	for {
 		scs.updateConfig(cfg)
 	waitForChans:
+		select {
+		case <-globalStopCh:
+			stop()
+			return
+		default:
+		}
 		select {
 		case <-sighupCh:
 			logger.Infof("SIGHUP received; reloading Prometheus configs from %q", configFile)
@@ -196,11 +210,7 @@ func runScraper(configFile string, pushData func(at *auth.Token, wr *prompb.Writ
 			configReloads.Inc()
 			configTimestamp.Set(fasttime.UnixTimestamp())
 		case <-globalStopCh:
-			cfg.mustStop()
-			logger.Infof("stopping Prometheus scrapers")
-			startTime := time.Now()
-			scs.stop()
-			logger.Infof("stopped Prometheus scrapers in %.3f seconds", time.Since(startTime).Seconds())
+			stop()
 			return
 		}
 	}

lib/storage/block.go

@@ -163,7 +163,8 @@ func (b *Block) deduplicateSamplesDuringMerge() {
 		// Nothing to dedup.
 		return
 	}
-	dedupInterval := GetDedupInterval()
+	maxTimestamp := srcTimestamps[len(srcTimestamps)-1]
+	dedupInterval := GetDedupInterval(maxTimestamp)
 	if dedupInterval <= 0 {
 		// Deduplication is disabled.
 		return

lib/storage/dedup.go

@@ -1,29 +1,11 @@
 package storage
 
 import (
-	"time"
-
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/decimal"
 )
 
-// SetDedupInterval sets the deduplication interval, which is applied to raw samples during data ingestion and querying.
-//
-// De-duplication is disabled if dedupInterval is 0.
-//
-// This function must be called before initializing the storage.
-func SetDedupInterval(dedupInterval time.Duration) {
-	globalDedupInterval = dedupInterval.Milliseconds()
-}
-
-// GetDedupInterval returns the dedup interval in milliseconds, which has been set via SetDedupInterval.
-func GetDedupInterval() int64 {
-	return globalDedupInterval
-}
-
-var globalDedupInterval int64
-
 func isDedupEnabled() bool {
-	return globalDedupInterval > 0
+	return len(downsamplingPeriods) > 0
 }
 
 // DeduplicateSamples removes samples from src* if they are closer to each other than dedupInterval in milliseconds.

lib/storage/downsampling.go

@@ -0,0 +1,123 @@
+package storage
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
+	"github.com/VictoriaMetrics/metricsql"
+)
+
+// SetDownsamplingPeriods configures downsampling.
+//
+// The function must be called before opening or creating any storage.
+func SetDownsamplingPeriods(periods []string, dedupInterval time.Duration) error {
+	dsps, err := parseDownsamplingPeriods(periods)
+	if err != nil {
+		return err
+	}
+	dedupIntervalMs := dedupInterval.Milliseconds()
+	if dedupIntervalMs > 0 {
+		if len(dsps) > 0 && dsps[len(dsps)-1].Offset == 0 {
+			return fmt.Errorf("-dedup.minScrapeInterval=%s cannot be used if -downsampling.period=%s contains zero offset", dedupInterval, periods)
+		}
+		// Deduplication is a special case of downsampling with zero offset.
+		dsps = append(dsps, DownsamplingPeriod{
+			Offset:   0,
+			Interval: dedupIntervalMs,
+		})
+	}
+	downsamplingPeriods = dsps
+	return nil
+}
+
+// DownsamplingPeriod describes downsampling period
+type DownsamplingPeriod struct {
+	// Offset in milliseconds from the current time when the downsampling with the given interval must be applied
+	Offset int64
+	// Interval for downsampling - only a single sample is left per each interval
+	Interval int64
+}
+
+// String implements interface
+func (dsp DownsamplingPeriod) String() string {
+	offset := time.Duration(dsp.Offset) * time.Millisecond
+	interval := time.Duration(dsp.Interval) * time.Millisecond
+	return fmt.Sprintf("%s:%s", offset, interval)
+}
+
+func (dsp *DownsamplingPeriod) parse(s string) error {
+	idx := strings.Index(s, ":")
+	if idx <= 0 {
+		return fmt.Errorf("incorrect format for downsampling period: %s, want `offset:interval` format", s)
+	}
+	offsetStr, intervalStr := s[:idx], s[idx+1:]
+	interval, err := metricsql.DurationValue(intervalStr, 0)
+	if err != nil {
+		return fmt.Errorf("incorrect interval: %s format for downsampling interval: %s err: %w", intervalStr, s, err)
+	}
+	offset, err := metricsql.DurationValue(offsetStr, 0)
+	if err != nil {
+		return fmt.Errorf("incorrect duration: %s format for downsampling offset: %s err: %w", offsetStr, s, err)
+	}
+	dsp.Interval = interval
+	dsp.Offset = offset
+	// sanity check
+	if offset > 0 && interval > offset {
+		return fmt.Errorf("downsampling interval=%d cannot exceed offset=%d", dsp.Interval, dsp.Offset)
+	}
+	return nil
+}
+
+var downsamplingPeriods []DownsamplingPeriod
+
+// GetDedupInterval returns dedup interval, which must be applied to samples with the given timestamp.
+func GetDedupInterval(timestamp int64) int64 {
+	dsp := getDownsamplingPeriod(timestamp)
+	return dsp.Interval
+}
+
+// getDownsamplingPeriod returns downsampling period, which must be used for the given timestamp
+func getDownsamplingPeriod(timestamp int64) DownsamplingPeriod {
+	offset := int64(fasttime.UnixTimestamp())*1000 - timestamp
+	for _, dsp := range downsamplingPeriods {
+		if offset >= dsp.Offset {
+			return dsp
+		}
+	}
+	return DownsamplingPeriod{}
+}
+
+func parseDownsamplingPeriods(periods []string) ([]DownsamplingPeriod, error) {
+	if len(periods) == 0 {
+		return nil, nil
+	}
+	var dsps []DownsamplingPeriod
+	for _, period := range periods {
+		var dsp DownsamplingPeriod
+		if err := dsp.parse(period); err != nil {
+			return nil, fmt.Errorf("cannot parse downsampling period %q: %w", period, err)
+		}
+		dsps = append(dsps, dsp)
+	}
+	sort.Slice(dsps, func(i, j int) bool {
+		return dsps[i].Offset > dsps[j].Offset
+	})
+	dspPrev := dsps[0]
+	// sanity checks.
+	for _, dsp := range dsps[1:] {
+		if dspPrev.Interval <= dsp.Interval {
+			return nil, fmt.Errorf("prev downsampling interval %d must be bigger than the next interval %d", dspPrev.Interval, dsp.Interval)
+		}
+		if dspPrev.Offset == dsp.Offset {
+			return nil, fmt.Errorf("duplicate downsampling offset: %d", dsp.Offset)
+		}
+		if dspPrev.Interval%dsp.Interval != 0 {
+			return nil, fmt.Errorf("downsamping intervals must be multiples; prev: %d, current: %d", dspPrev.Interval, dsp.Interval)
+		}
+		dspPrev = dsp
+	}
+	return dsps, nil
+}

lib/storage/downsampling_test.go

@@ -0,0 +1,62 @@
+package storage
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParseDownsamplingPeriodsFailure(t *testing.T) {
+	f := func(name string, src []string) {
+		t.Helper()
+		t.Run(name, func(t *testing.T) {
+			if _, err := parseDownsamplingPeriods(src); err == nil {
+				t.Fatalf("want fail for input: %s", strings.Join(src, ","))
+			}
+		})
+	}
+	f("empty duration", []string{"15d"})
+	f("empty interval", []string{":1m"})
+	f("incorrect duration decrease", []string{"30d:15h", "60d:1h"})
+	f("duplicate offset", []string{"30d:15h", "30d:1h"})
+	f("duplicate interval", []string{"60d:1h", "30d:1h"})
+	f("not multiple intervals", []string{"90d:12h", "60:9h", "30d:7h"})
+}
+
+func TestParseDownsamplingPeriodsSuccess(t *testing.T) {
+	f := func(name string, src []string, expected []DownsamplingPeriod) {
+		t.Helper()
+		t.Run(name, func(t *testing.T) {
+			dsps, err := parseDownsamplingPeriods(src)
+			if err != nil {
+				t.Fatalf("cannot parse downsampling configuration for: %s, err: %s", strings.Join(src, ","), err)
+			}
+			assertDownsamplingPeriods(t, expected, dsps)
+		})
+	}
+	f("one period", []string{"30d:1m"}, []DownsamplingPeriod{
+		{Offset: 30 * 24 * 3600 * 1000, Interval: 60 * 1000},
+	})
+	f("three periods", []string{"15d:30s", "30d:1m", "60d:15m"}, []DownsamplingPeriod{
+		{Offset: 60 * 24 * 3600 * 1000, Interval: 15 * 60 * 1000},
+		{Offset: 30 * 24 * 3600 * 1000, Interval: 60 * 1000},
+		{Offset: 15 * 24 * 3600 * 1000, Interval: 30 * 1000},
+	})
+	f("with the same divider periods", []string{"15d:1m", "30d:7m", "60d:14m", "90d:28m"}, []DownsamplingPeriod{
+		{Offset: 90 * 24 * 3600 * 1000, Interval: 28 * 60 * 1000},
+		{Offset: 60 * 24 * 3600 * 1000, Interval: 14 * 60 * 1000},
+		{Offset: 30 * 24 * 3600 * 1000, Interval: 7 * 60 * 1000},
+		{Offset: 15 * 24 * 3600 * 1000, Interval: 60 * 1000},
+	})
+}
+
+func assertDownsamplingPeriods(t *testing.T, want, got []DownsamplingPeriod) {
+	t.Helper()
+	if len(want) != len(got) {
+		t.Fatalf("len mismatch, want: %d, got: %d", len(want), len(got))
+	}
+	for i := 0; i < len(want); i++ {
+		if want[i] != got[i] {
+			t.Fatalf("want period: %s, got period: %s, idx: %d", want[i], got[i], i)
+		}
+	}
+}