vendor: update metrics package

Related to https://github.com/VictoriaMetrics/metrics/issues/85

docs/victoriametrics/changelog/CHANGELOG.md

@@ -37,6 +37,7 @@ See also [LTS releases](https://docs.victoriametrics.com/victoriametrics/lts-rel
 * FEATURE: [vmsingle](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/) and `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/): Disable `/graphite/tags/tagSeries` and `/graphite/tags/tagMultiSeries` for Graphite tag registration since it is unlikely it is used in context of VictoriaMetrics. See [10544](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10544).
 * FEATURE: [vmui](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmui): rename debug tools buttons for clarity. See [#10453](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10453).
 
+* BUGFIX: all VictoriaMetrics components: replace `histogram` with `untyped` metric metadata type for [VictoriaMetrics histograms](https://docs.victoriametrics.com/victoriametrics/keyconcepts/#histogram) when `-metrics.exposeMetadata` is set. See [#82](https://github.com/VictoriaMetrics/metrics/issues/82).
 * BUGFIX: [vmauth](https://docs.victoriametrics.com/victoriametrics/vmauth/): properly route requests to `default_url`. Previously, `request_path` query arg could be set incorrectly during concurrent requests. See [#10626](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10626).
 * BUGFIX: [vmui](https://docs.victoriametrics.com/victoriametrics/single-server-victoriametrics/#vmui): use `increase_pure` instead of `rate` for histogram heatmaps in Explore Metrics to correctly display the first observation in each new bucket. See [#10365](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10365). Thanks to @ab0utbla-k for the contribution.
 * BUGFIX: [dashboards/vmauth](https://grafana.com/grafana/dashboards/21394): fix `requested from system` and `heap inuse` expressions in the memory usage panel. See [#10574](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10574).

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/VictoriaMetrics/VictoriaLogs v0.0.0-20260218111324-95b48d57d032
 	github.com/VictoriaMetrics/easyproto v1.2.0
 	github.com/VictoriaMetrics/fastcache v1.13.3
-	github.com/VictoriaMetrics/metrics v1.41.2
+	github.com/VictoriaMetrics/metrics v1.42.0
 	github.com/VictoriaMetrics/metricsql v0.85.0
 	github.com/aws/aws-sdk-go-v2 v1.41.1
 	github.com/aws/aws-sdk-go-v2/config v1.32.8

go.sum

@@ -60,6 +60,8 @@ github.com/VictoriaMetrics/fastcache v1.13.3 h1:rBabE0iIxcqKEMCwUmwHZ9dgEqXerg8F
 github.com/VictoriaMetrics/fastcache v1.13.3/go.mod h1:hHXhl4DA2fTL2HTZDJFXWgW0LNjo6B+4aj2Wmng3TjU=
 github.com/VictoriaMetrics/metrics v1.41.2 h1:pLQ4Mw9TqXFq3ZsZVJkz88JHpjL9LY5NHTY3v2gBNAw=
 github.com/VictoriaMetrics/metrics v1.41.2/go.mod h1:xDM82ULLYCYdFRgQ2JBxi8Uf1+8En1So9YUwlGTOqTc=
+github.com/VictoriaMetrics/metrics v1.42.0 h1:t/OGs3BjMUYhxw/h83Z28qAss8DuA4QEVwO4NwJ9hZc=
+github.com/VictoriaMetrics/metrics v1.42.0/go.mod h1:xDM82ULLYCYdFRgQ2JBxi8Uf1+8En1So9YUwlGTOqTc=
 github.com/VictoriaMetrics/metricsql v0.85.0 h1:xI+EfqsOgY0T2yd7p8hcYQ52LOtf+1i8fQQzQ+RGtZM=
 github.com/VictoriaMetrics/metricsql v0.85.0/go.mod h1:d4EisFO6ONP/HIGDYTAtwrejJBBeKGQYiRl095bS4QQ=
 github.com/VividCortex/ewma v1.2.0 h1:f58SaIzcDXrSy3kWaHNvuJgJ3Nmz59Zji6XoJR/q1ow=

vendor/github.com/VictoriaMetrics/metrics/histogram.go

@@ -266,5 +266,13 @@ func (h *Histogram) getSum() float64 {
 }
 
 func (h *Histogram) metricType() string {
-	return "histogram"
+	// The Prometheus data model requires histogram metrics to expose "le" labels.
+	// Some collectors, such as the OpenTelemetry (OTEL) Collector, strictly enforce
+	// this data model and apply transformations based on the metric type.
+	//
+	// Because Prometheus metric types are strongly typed and we don't have control over it,
+	// introducing a custom "vm_histogram" type is not possible.
+	//
+	// So it's better to use untyped metric type.
+	return "untyped"
 }

vendor/github.com/VictoriaMetrics/metrics/metrics.go

@@ -13,6 +13,7 @@
 package metrics
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"sort"
@@ -42,6 +43,11 @@ func init() {
 var (
 	registeredSets     = make(map[*Set]struct{})
 	registeredSetsLock sync.Mutex
+	bufPool            = sync.Pool{
+		New: func() any {
+			return bytes.NewBuffer(make([]byte, 0, 64*1024))
+		},
+	}
 )
 
 // RegisterSet registers the given set s for metrics export via global WritePrometheus() call.
@@ -248,6 +254,23 @@ func WriteProcessMetrics(w io.Writer) {
 	writePushMetrics(w)
 }
 
+// WriteGoMetrics writes Go runtime metrics to w.
+// This includes runtime/metrics such as memory stats, GC stats, goroutine counts, etc.
+func WriteGoMetrics(w io.Writer) {
+	writeGoMetrics(w)
+}
+
+// WriteProcMetrics writes OS-level process metrics to w by reading
+// the /proc filesystem (CPU, memory, file descriptors, PSI, etc.).
+func WriteProcMetrics(w io.Writer) {
+	writeProcessMetrics(w)
+}
+
+// WritePushMetrics writes push-mode related metrics to w.
+func WritePushMetrics(w io.Writer) {
+	writePushMetrics(w)
+}
+
 // WriteFDMetrics writes `process_max_fds` and `process_open_fds` metrics to w.
 func WriteFDMetrics(w io.Writer) {
 	writeFDMetrics(w)

vendor/github.com/VictoriaMetrics/metrics/set.go

@@ -35,7 +35,10 @@ func NewSet() *Set {
 // WritePrometheus writes all the metrics from s to w in Prometheus format.
 func (s *Set) WritePrometheus(w io.Writer) {
 	// Collect all the metrics in in-memory buffer in order to prevent from long locking due to slow w.
-	var bb bytes.Buffer
+	bb := bufPool.Get().(*bytes.Buffer)
+	bb.Reset()
+	defer bufPool.Put(bb)
+
 	lessFunc := func(i, j int) bool {
 		// the sorting must be stable.
 		// see edge cases why we can't simply do `s.a[i].name < s.a[j].name` here:
@@ -77,7 +80,7 @@ func (s *Set) WritePrometheus(w io.Writer) {
 		if !isMetadataEnabled() {
 			// Call marshalTo without the global lock, since certain metric types such as Gauge
 			// can call a callback, which, in turn, can try calling s.mu.Lock again.
-			nm.metric.marshalTo(nm.name, &bb)
+			nm.metric.marshalTo(nm.name, bb)
 			continue
 		}
 
@@ -93,7 +96,7 @@ func (s *Set) WritePrometheus(w io.Writer) {
 		if metricFamily != prevMetricFamily {
 			// write metadata only once per metric family
 			metricType := nm.metric.metricType()
-			writeMetadata(&bb, metricFamily, metricType)
+			writeMetadata(bb, metricFamily, metricType)
 			prevMetricFamily = metricFamily
 		}
 		bb.Write(metricsWithMetadataBuf.Bytes())

vendor/modules.txt

@@ -142,7 +142,7 @@ github.com/VictoriaMetrics/easyproto
 # github.com/VictoriaMetrics/fastcache v1.13.3
 ## explicit; go 1.24.0
 github.com/VictoriaMetrics/fastcache
-# github.com/VictoriaMetrics/metrics v1.41.2
+# github.com/VictoriaMetrics/metrics v1.42.0
 ## explicit; go 1.24.0
 github.com/VictoriaMetrics/metrics
 # github.com/VictoriaMetrics/metricsql v0.85.0