Add docs-check-links target to docs Makefile

Commit adds `--vm-headers` and `--vm-bearer-token` flags. The flags are
added to vmctl sub-commands: opentsdb, influx, remote-read, prometheus, mimir, thanos. vm-native sub-command already supports similar flags. The flags are useful when vmctl imports data to a VictoriaMetrics instance
protected by authentication.

Previously, to work around this limitation, a vmagent with remote write auth configured had to be spun up, and vmctl would write via it. This change allows vmctl to write directly.

Fixes https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8897
PR https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11089

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/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: %s", dstAddr, err)
 					}
 
 					// create TLS config
@@ -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: %s", 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/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/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/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
 }
 

docs/Makefile

@@ -32,6 +32,17 @@ docs-image:
 		--platform $(DOCKER_PLATFORM) \
 		vmdocs
 
+docs-check-links: docs-image
+	rm -rf vmdocs/public
+	docker run \
+		--rm \
+		--platform $(DOCKER_PLATFORM) \
+		-v ./vmdocs:/opt/docs \
+		$(shell for d in ./docs/*/; do printf ' -v %s:/opt/docs/content/%s' "$${d}" "$$(basename $${d})"; done) \
+		--entrypoint /bin/sh \
+		vmdocs-docker-package \
+			-c "yarn install && hugo --minify && yarn run check-links"
+
 docs-debug: docs docs-image
 	docker run \
 		--rm \

docs/victoriametrics/changelog/CHANGELOG.md

@@ -26,7 +26,12 @@ 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.
+* 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).
+
+* 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: [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 [6c3c548](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/6c3c548ddb0385b749e731f52276f130e2a4e4a8)
 
 ## [v1.145.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.145.0)
 

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_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.md

@@ -546,7 +546,7 @@ tags at [Docker Hub](https://hub.docker.com/r/victoriametrics/vmalert/tags) and
 
 ## Reading rules from object storage
 
-The [Enterprise version](https://docs.victoriametrics.com/victoriametrics/enterprise/) of `vmalert` may read alerting and recording rules
+[Enterprise version](https://docs.victoriametrics.com/victoriametrics/enterprise/) of `vmalert` may read alerting and recording rules
 from object storage:
 
 * `./bin/vmalert -rule=s3://bucket/dir/alert.rules` would read rules from the given path at S3 bucket
@@ -563,8 +563,6 @@ The following [command-line flags](#flags) can be used for fine-tuning access to
 * `-s3.customEndpoint` - custom S3 endpoint for use with S3-compatible storages (e.g. MinIO). S3 is used if not set.
 * `-s3.forcePathStyle` - prefixing endpoint with bucket name when set false, true by default.
 
-See [providing credentials as a file](https://docs.victoriametrics.com/victoriametrics/vmbackup/#providing-credentials-as-a-file) for details on how to create and use credentials to access S3-compatible buckets and Google Cloud Storage.
-
 ## Topology examples
 
 The following sections are showing how `vmalert` may be used and configured

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

@@ -204,80 +204,38 @@ See [this article](https://medium.com/@valyala/speeding-up-backups-for-big-time-
 
 ### Providing credentials as a file
 
-`vmbackup`, `vmbackupmanager`, and [`vmalert`](https://docs.victoriametrics.com/victoriametrics/vmalert/) can load credentials from a file via the `-credsFilePath` flag to access remote S3-compatible buckets and Google Cloud Storage.
+Obtaining credentials from a file.
 
-To use a credential file, add the flag:
+Add flag `-credsFilePath=/etc/credentials` with the following content:
 
-```sh
--credsFilePath=/etc/credentials
-```
+* for S3 (AWS, MinIO or other S3 compatible storages):
 
-The argument should point to a file with one of the formats below, depending on the storage provider.
+     ```sh
+     [default]
+     aws_access_key_id=theaccesskey
+     aws_secret_access_key=thesecretaccesskeyvalue
+    ```
 
-#### S3 (AWS and S3-compatible)
+* for GCP cloud storage:
 
-1. In AWS, [create an IAM user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html) or role with permissions to read and write the target bucket.
-2. [Create an access key](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html) for that IAM identity and copy the **Access key** and **Secret access key** values
-3. On the machine running `vmbackup`, create a credentials file with the following content and point `-credsFilePath` to it:
-
-   ```ini
-   [default]
-   aws_access_key_id=YOUR_AWS_ACCESS_KEY
-   aws_secret_access_key=YOUR_AWS_SECRET_ACCESS_KEY
-   ```
-
-This format matches the standard shared AWS credentials file used by the [AWS CLI](https://docs.aws.amazon.com/cli/v1/userguide/cli-configure-files.html) and [AWS SDKs](https://docs.aws.amazon.com/sdkref/latest/guide/file-format.html).
-
-For S3-compatible backends such as [MinIO](https://www.min.io/) or [Ceph](https://ceph.io/), create access keys in the respective
-system and use the same file format and set a custom endpoint with `-customS3Endpoint`. 
-
-For example:
-
-```sh
-vmbackup \
-  -storageDataPath=/data \
-  -snapshot.createURL=http://localhost:8428/snapshot/create \
-  -dst=s3://victoriametrics-backup/backup01 \
-  -customS3Endpoint=http://minio.example.local:9000 \
-  -credsFilePath=/etc/credentials
-```
-
-#### Google Cloud Storage (GCS)
-
-To create an IAM user and download the credential file, follow these steps:
-
-1. Open the Google Cloud Console and go to **IAM & Admin → Service Accounts**.
-2. Click **Create service account**.
-3. Enter a service account name.
-4. Assign the role the account needs to access Google Cloud Storage. See [IAM permissions for JSON methods](https://docs.cloud.google.com/storage/docs/access-control/iam-json) for more details.
-5. Open the service account, go to **Keys**, then click **Add key → Create new key**.
-6. Choose **JSON** as the key type
-7. Save the downloaded JSON file on the machine running `vmbackup` and point `-credsFilePath` to it. The file contents look similar to:
-
-   ```json
-   {
-     "type": "service_account",
-     "project_id": "project-id",
-     "private_key_id": "key-id",
-     "private_key": "-----BEGIN PRIVATE KEY-----\nprivate-key\n-----END PRIVATE KEY-----\n",
-     "client_email": "service-account-email",
-     "client_id": "client-id",
-     "auth_uri": "https://accounts.google.com/o/oauth2/auth",
-     "token_uri": "https://accounts.google.com/o/oauth2/token",
-     "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
-     "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/service-account-email"
-   }
-   ```
-
-This JSON is the standard service account key format defined by [Google Cloud IAM](https://developers.google.com/workspace/guides/create-credentials) and is used by Google client libraries and tools.
-
-#### Azure Blob Storage
-
-Azure Blob Storage uses environment variables rather than `-credsFilePath` in `vmbackup`. See [providing credentials via env variables](https://docs.victoriametrics.com/victoriametrics/vmbackup/#providing-credentials-via-env-variables) for details.
+    ```json
+    {
+           "type": "service_account",
+           "project_id": "project-id",
+           "private_key_id": "key-id",
+           "private_key": "-----BEGIN PRIVATE KEY-----\nprivate-key\n-----END PRIVATE KEY-----\n",
+           "client_email": "service-account-email",
+           "client_id": "client-id",
+           "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+           "token_uri": "https://accounts.google.com/o/oauth2/token",
+           "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+           "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/service-account-email"
+    }
+    ```
 
 ### Providing credentials via env variables
 
-Obtaining credentials from environment variables.
+Obtaining credentials from env variables.
 
 * For AWS S3 compatible storages set env variable `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`.
   Also you can set env variable `AWS_SHARED_CREDENTIALS_FILE` with path to credentials file.
@@ -442,6 +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

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()

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/storage/search.go

@@ -468,15 +468,21 @@ func (tf *TagFilter) Unmarshal(src []byte) ([]byte, error) {
 	return src, nil
 }
 
-// String returns string representation of the search query.
+// String returns string representation of the search query: tag filters and time range.
 func (sq *SearchQuery) String() string {
+	start := TimestampToHumanReadableFormat(sq.MinTimestamp)
+	end := TimestampToHumanReadableFormat(sq.MaxTimestamp)
+	a := sq.FiltersString()
+	return fmt.Sprintf("filters=%s, timeRange=[%s..%s]", a, start, end)
+}
+
+// FiltersString returns string representation of the tag filters.
+func (sq *SearchQuery) FiltersString() []string {
 	a := make([]string, len(sq.TagFilterss))
 	for i, tfs := range sq.TagFilterss {
 		a[i] = tagFiltersToString(tfs)
 	}
-	start := TimestampToHumanReadableFormat(sq.MinTimestamp)
-	end := TimestampToHumanReadableFormat(sq.MaxTimestamp)
-	return fmt.Sprintf("filters=%s, timeRange=[%s..%s]", a, start, end)
+	return a
 }
 
 func tagFiltersToString(tfs []TagFilter) string {

lib/timeutil/duration.go

@@ -19,7 +19,7 @@ func ParseDuration(s string) (time.Duration, error) {
 		return 0, err
 	}
 	if ms < minValidMilli || maxValidMilli < ms {
-		return 0, fmt.Errorf("duration %q must be in the range [%v, %v]", s, minDuration, maxDuration)
+		return 0, fmt.Errorf("duration %q must be in the range [%s, %s]", s, minDuration, maxDuration)
 	}
 	return time.Duration(ms) * time.Millisecond, nil
 }

lib/timeutil/time.go

@@ -28,7 +28,6 @@ func ParseTimeMsec(s string) (int64, error) {
 // See https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#timestamp-formats
 //
 // If s doesn't contain timezone information, then the local timezone is used.
-// The time must be in the range [1970-01-01T00:00:00Z, 2262-04-11T23:47:16Z].
 //
 // It returns unix timestamp in nanoseconds.
 func ParseTimeAt(s string, currentTimestamp int64) (int64, error) {
@@ -71,14 +70,10 @@ func ParseTimeAt(s string, currentTimestamp int64) (int64, error) {
 		if err != nil {
 			return 0, err
 		}
-		if d > 0 {
+		if d < 0 {
 			d = -d
 		}
-		nsec := currentTimestamp + int64(d)
-		if nsec < 0 {
-			return 0, fmt.Errorf("time %s (%v) must be in the range [%v, %v]", sOrig, time.Unix(0, nsec).UTC(), minTime, maxTime)
-		}
-		return nsec, nil
+		return subInt64NoOverflow(currentTimestamp, int64(d)), nil
 	}
 	if len(s) == 4 {
 		// Parse YYYY
@@ -115,22 +110,28 @@ func ParseTimeAt(s string, currentTimestamp int64) (int64, error) {
 	return parseTimeAt(time.RFC3339, sOrig, 0, sOrig)
 }
 
-var (
-	minTime = time.Unix(0, 0).UTC()
-	maxTime = time.Unix(0, math.MaxInt64).UTC()
-)
-
-func parseTimeAt(layout, value string, tzOffsetNanos int64, sOrig string) (int64, error) {
+func parseTimeAt(layout, value string, tzOffsetNsec int64, sOrig string) (int64, error) {
 	t, err := time.Parse(layout, value)
 	if err != nil {
 		return 0, err
 	}
-	tzOffset := time.Duration(tzOffsetNanos)
-	t = t.UTC().Add(tzOffset)
-	if t.Before(minTime) || t.After(maxTime) {
-		return 0, fmt.Errorf("time %s (%v) must be in the range [%v, %v]", sOrig, t, minTime, maxTime)
+	nsec := t.UnixNano()
+
+	return subInt64NoOverflow(nsec, -tzOffsetNsec), nil
+}
+
+func subInt64NoOverflow(a, b int64) int64 {
+	if b >= 0 {
+		if a < math.MinInt64+b {
+			return math.MinInt64
+		}
+		return a - b
 	}
-	return t.UnixNano(), nil
+
+	if a > math.MaxInt64+b {
+		return math.MaxInt64
+	}
+	return a - b
 }
 
 // TryParseUnixTimestamp parses s as unix timestamp in seconds, milliseconds, microseconds or nanoseconds and returns the parsed timestamp in nanoseconds.

lib/timeutil/time_test.go

@@ -210,6 +210,7 @@ func TestParseTimeAtLimits(t *testing.T) {
 
 	f := func(s string, wantTime time.Time) {
 		t.Helper()
+
 		got, err := ParseTimeAt(s, now.UnixNano())
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
@@ -231,42 +232,38 @@ func TestParseTimeAtLimits(t *testing.T) {
 	west := location(t, "Etc/GMT+12") // UTC-12:00
 	var s string
 
-	// min timestamp
-	f("0", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	s = fmt.Sprintf("-%d", now.Unix())
-	f(s, time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	s = fmt.Sprintf("now-%d", now.Unix())
-	f(s, time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-
 	// min year
-	f("1970Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1971+14:00", time.Date(1971, 1, 1, 0, 0, 0, 0, east))
-	f("1970-12:00", time.Date(1970, 1, 1, 0, 0, 0, 0, west))
+	f("1678Z", time.Date(1678, 1, 1, 0, 0, 0, 0, time.UTC))
+	f("1678+14:00", time.Date(1678, 1, 1, 0, 0, 0, 0, east))
+	f("1678-12:00", time.Date(1678, 1, 1, 0, 0, 0, 0, west))
 
 	// min month
-	f("1970-01Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1970-02+14:00", time.Date(1970, 2, 1, 0, 0, 0, 0, east))
-	f("1970-01-12:00", time.Date(1970, 1, 1, 0, 0, 0, 0, west))
+	f("1677-10Z", time.Date(1677, 10, 1, 0, 0, 0, 0, time.UTC))
+	f("1677-10+14:00", time.Date(1677, 10, 1, 0, 0, 0, 0, east))
+	f("1677-10-12:00", time.Date(1677, 10, 1, 0, 0, 0, 0, west))
 
 	// min day
-	f("1970-01-01Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1970-01-02+14:00", time.Date(1970, 1, 2, 0, 0, 0, 0, east))
-	f("1970-01-01-12:00", time.Date(1970, 1, 1, 0, 0, 0, 0, west))
+	f("1677-09-22Z", time.Date(1677, 9, 22, 0, 0, 0, 0, time.UTC))
+	f("1677-09-22+14:00", time.Date(1677, 9, 22, 0, 0, 0, 0, east))
+	f("1677-09-22-12:00", time.Date(1677, 9, 22, 0, 0, 0, 0, west))
 
 	// min hour
-	f("1970-01-01T00Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1970-01-01T14+14:00", time.Date(1970, 1, 1, 14, 0, 0, 0, east))
-	f("1969-12-31T12-12:00", time.Date(1969, 12, 31, 12, 0, 0, 0, west))
+	f("1677-09-21T01Z", time.Date(1677, 9, 21, 1, 0, 0, 0, time.UTC))
+	f("1677-09-21T15+14:00", time.Date(1677, 9, 21, 15, 0, 0, 0, east))
+	f("1677-09-21T01+14:00", time.Unix(0, math.MinInt64))
+	f("1677-09-21T01-12:00", time.Date(1677, 9, 21, 1, 0, 0, 0, west))
 
 	// min minute
-	f("1970-01-01T00:00Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1970-01-01T14:00+14:00", time.Date(1970, 1, 1, 14, 0, 0, 0, east))
-	f("1969-12-31T12:00-12:00", time.Date(1969, 12, 31, 12, 0, 0, 0, west))
+	f("1677-09-21T00:12Z", time.Date(1677, 9, 21, 0, 12, 0, 0, time.UTC))
+	f("1677-09-21T15:12Z+14:00", time.Date(1677, 9, 21, 15, 12, 0, 0, east))
+	f("1677-09-21T00:13Z+14:00", time.Unix(0, math.MinInt64))
+	f("1677-09-21T00:13Z-12:00", time.Date(1677, 9, 21, 0, 13, 0, 0, west))
 
 	// min second
-	f("1970-01-01T00:00:00Z", time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC))
-	f("1970-01-01T14:00:00+14:00", time.Date(1970, 1, 1, 14, 0, 0, 0, east))
-	f("1969-12-31T12:00:00-12:00", time.Date(1969, 12, 31, 12, 0, 0, 0, west))
+	f("1677-09-21T00:12:43Z", time.Date(1677, 9, 21, 0, 12, 43, 0, time.UTC))
+	f("1677-09-21T15:12:43Z+14:00", time.Date(1677, 9, 21, 15, 12, 43, 0, east))
+	f("1677-09-21T00:12:44Z+14:00", time.Unix(0, math.MinInt64))
+	f("1677-09-21T00:12:44Z-12:00", time.Date(1677, 9, 21, 0, 12, 44, 0, west))
 
 	// max year
 	f("2262Z", time.Date(2262, 1, 1, 0, 0, 0, 0, time.UTC))
@@ -280,23 +277,26 @@ func TestParseTimeAtLimits(t *testing.T) {
 
 	// max day
 	f("2262-04-11Z", time.Date(2262, 4, 11, 0, 0, 0, 0, time.UTC))
-	f("2262-04-12+14:00", time.Date(2262, 4, 12, 0, 0, 0, 0, east))
+	f("2262-04-11+14:00", time.Date(2262, 4, 11, 0, 0, 0, 0, east))
 	f("2262-04-11-12:00", time.Date(2262, 4, 11, 0, 0, 0, 0, west))
 
 	// max hour
 	f("2262-04-11T23Z", time.Date(2262, 4, 11, 23, 0, 0, 0, time.UTC))
-	f("2262-04-12T13+14:00", time.Date(2262, 4, 12, 13, 0, 0, 0, east))
+	f("2262-04-11T23+14:00", time.Date(2262, 4, 11, 23, 0, 0, 0, east))
 	f("2262-04-11T11-12:00", time.Date(2262, 4, 11, 11, 0, 0, 0, west))
+	f("2262-04-11T23-12:00", time.Unix(0, math.MaxInt64))
 
 	// max minute
 	f("2262-04-11T23:47Z", time.Date(2262, 4, 11, 23, 47, 0, 0, time.UTC))
-	f("2262-04-12T13:47+14:00", time.Date(2262, 4, 12, 13, 47, 0, 0, east))
+	f("2262-04-11T23:47+14:00", time.Date(2262, 4, 11, 23, 47, 0, 0, east))
 	f("2262-04-11T11:47-12:00", time.Date(2262, 4, 11, 11, 47, 0, 0, west))
+	f("2262-04-11T23:47-12:00", time.Unix(0, math.MaxInt64))
 
 	// max second
 	f("2262-04-11T23:47:16Z", time.Date(2262, 4, 11, 23, 47, 16, 0, time.UTC))
-	f("2262-04-12T13:47:16+14:00", time.Date(2262, 4, 12, 13, 47, 16, 0, east))
+	f("2262-04-11T23:47:16+14:00", time.Date(2262, 4, 11, 23, 47, 16, 0, east))
 	f("2262-04-11T11:47:16-12:00", time.Date(2262, 4, 11, 11, 47, 16, 0, west))
+	f("2262-04-11T23:47:16-12:00", time.Unix(0, math.MaxInt64))
 
 	// max timestamp
 	s = fmt.Sprintf("%d", int64(maxValidSecond))
@@ -324,85 +324,6 @@ func TestParseTimeAtLimits(t *testing.T) {
 	f(s, time.Date(1970, 4, 17, 18, 2, 52, 36_854_776, time.UTC))
 }
 
-func TestParseTimeAtOutsideLimits(t *testing.T) {
-	now := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
-
-	f := func(s string) {
-		t.Helper()
-		got, err := ParseTimeAt(s, now.UnixNano())
-		if err == nil {
-			t.Fatalf("expected error but got %d", got)
-		}
-		if !strings.Contains(err.Error(), "must be in the range") {
-			t.Fatalf("expected error: %v", err)
-		}
-	}
-
-	// min timestamp
-	f(fmt.Sprintf("-%d", now.Unix()+1))
-	f(fmt.Sprintf("now-%d", now.Unix()+1))
-
-	// min year
-	f("1969Z")
-	f("1970+14:00")
-	f("1969-12:00")
-
-	// min month
-	f("1969-12Z")
-	f("1970-01+14:00")
-	f("1969-12-12:00")
-
-	// min day
-	f("1969-12-31Z")
-	f("1970-01-01+14:00")
-	f("1969-12-31-12:00")
-
-	// min hour
-	f("1969-12-31T23Z")
-	f("1970-01-01T13+14:00")
-	f("1969-12-31T11-12:00")
-
-	// min minute
-	f("1969-12-31T23:59Z")
-	f("1970-01-01T13:59+14:00")
-	f("1969-12-31T11:59-12:00")
-
-	// min second
-	f("1969-12-31T23:59:59Z")
-	f("1970-01-01T13:59:59+14:00")
-	f("1969-12-31T11:59:59-12:00")
-
-	// max year
-	f("2263Z")
-	f("2263+14:00")
-	f("2263-12:00")
-
-	// max month
-	f("2262-05Z")
-	f("2262-05+14:00")
-	f("2262-05-12:00")
-
-	// max day
-	f("2262-04-12Z")
-	f("2262-04-13+14:00")
-	f("2262-04-12-12:00")
-
-	// max hour
-	f("2262-04-12T00Z")
-	f("2262-04-12T14+14:00")
-	f("2262-04-11T12-12:00")
-
-	// max minute
-	f("2262-04-11T23:48Z")
-	f("2262-04-12T13:48+14:00")
-	f("2262-04-11T11:48-12:00")
-
-	// max second
-	f("2262-04-11T23:47:17Z")
-	f("2262-04-12T13:47:17+14:00")
-	f("2262-04-11T11:47:17-12:00")
-}
-
 func TestParseTimeAtOutsideLimits_Nanos(t *testing.T) {
 	now := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
 
@@ -434,7 +355,6 @@ func TestParseTimeMsecFailure(t *testing.T) {
 	}
 
 	f("")
-	f("2263")
 	f("23-45:50")
 	f("1223-fo:ba")
 	f("1223-12:ba")

lib/vmalertproxy/vmalertproxy.go

@@ -0,0 +1,68 @@
+package vmalertproxy
+
+import (
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+)
+
+// Init initializes proxying requests to the given proxyURL when calling HandleRequest.
+//
+// Init must be called after flag.Parse(), since it uses command-line flags.
+func Init(proxyURL string) {
+	if len(proxyURL) == 0 {
+		return
+	}
+	pu, err := url.Parse(proxyURL)
+	if err != nil {
+		logger.Fatalf("cannot parse -vmalert.proxyURL=%q: %s", proxyURL, err)
+	}
+	vmalertProxyHost = pu.Host
+	vmalertProxy = httputil.NewSingleHostReverseProxy(pu)
+}
+
+// HandleRequest proxies the given request path to vmalert at proxyURL passed to Init().
+func HandleRequest(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 = path
+	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     *httputil.ReverseProxy
+)