add ability to use prometheus compat histogram

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.mod

@@ -5,7 +5,7 @@ go 1.22
 toolchain go1.23.2
 
 require (
-	github.com/VictoriaMetrics/metrics v1.35.1
+	go.unistack.org/metrics v0.0.1
 	go.unistack.org/micro/v3 v3.10.100
 )
 

go.sum

@@ -1,9 +1,9 @@
-github.com/VictoriaMetrics/metrics v1.35.1 h1:o84wtBKQbzLdDy14XeskkCZih6anG+veZ1SwJHFGwrU=
-github.com/VictoriaMetrics/metrics v1.35.1/go.mod h1:r7hveu6xMdUACXvB8TYdAj8WEsKzWB0EkpJN+RDtOf8=
 github.com/valyala/fastrand v1.1.0 h1:f+5HkLW4rsgzdNoleUOB69hyT9IlD2ZQh9GyDMfb5G8=
 github.com/valyala/fastrand v1.1.0/go.mod h1:HWqCzkrkg6QXT8V2EXWvXCoow7vLwOFN002oeRzjapQ=
 github.com/valyala/histogram v1.2.0 h1:wyYGAZZt3CpwUiIb9AU/Zbllg1llXyrtApRS815OLoQ=
 github.com/valyala/histogram v1.2.0/go.mod h1:Hb4kBwb4UxsaNbbbh+RRz8ZR6pdodR57tzWUS3BUzXY=
+go.unistack.org/metrics v0.0.1 h1:sCnGO059ZccGC/D34iRH121eSk+7ci5+OY9cl5K7GKY=
+go.unistack.org/metrics v0.0.1/go.mod h1:1FY4R7EKJa9Oz2D6wlGScNerpl6igRs9Cx/3et4Rgs4=
 go.unistack.org/micro/v3 v3.10.100 h1:yWOaU0ImCGm5k5MUzlIobJUOr+KLfrR/BoDZvcHyKxM=
 go.unistack.org/micro/v3 v3.10.100/go.mod h1:YzMldzHN9Ei+zy5t/Psu7RUWDZwUfrNYiStSQtTz90g=
 golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=

victoriametrics.go

@@ -4,17 +4,28 @@ import (
 	"io"
 	"time"
 
-	"github.com/VictoriaMetrics/metrics"
+	"go.unistack.org/metrics"
 	"go.unistack.org/micro/v3/meter"
 )
 
 type victoriametricsMeter struct {
-	set  *metrics.Set
-	opts meter.Options
+	set              *metrics.Set
+	opts             meter.Options
+	prometheusCompat bool
+}
+
+type prometheusCompatKey struct{}
+
+func PrometheusCompat(b bool) meter.Option {
+	return meter.SetOption(prometheusCompatKey{}, b)
 }
 
 func NewMeter(opts ...meter.Option) meter.Meter {
-	return &victoriametricsMeter{set: metrics.NewSet(), opts: meter.NewOptions(opts...)}
+	m := &victoriametricsMeter{set: metrics.NewSet(), opts: meter.NewOptions(opts...)}
+	if v, ok := m.opts.Context.Value(prometheusCompatKey{}).(bool); ok && v {
+		m.prometheusCompat = true
+	}
+	return m
 }
 
 func (r *victoriametricsMeter) Name() string {
@@ -55,6 +66,9 @@ func (r *victoriametricsMeter) Gauge(name string, f func() float64, labels ...st
 }
 
 func (r *victoriametricsMeter) Histogram(name string, labels ...string) meter.Histogram {
+	if r.prometheusCompat {
+		return r.set.GetOrCreateCompatibleHistogram(r.buildName(name, labels...))
+	}
 	return r.set.GetOrCreateHistogram(r.buildName(name, labels...))
 }
 
@@ -96,6 +110,7 @@ func (r *victoriametricsMeter) Write(w io.Writer, opts ...meter.Option) error {
 	if options.WriteFDMetrics {
 		metrics.WriteFDMetrics(w)
 	}
+
 	return nil
 }
 

victoriametrics_test.go

@@ -1,6 +1,7 @@
 package victoriametrics
 
 import (
+	"bytes"
 	"testing"
 )
 
@@ -16,3 +17,13 @@ func TestBuildName(t *testing.T) {
 	cnt := m.Counter("counter", "key", "val")
 	cnt.Inc()
 }
+
+func TestPrometheusCompat(t *testing.T) {
+	m := NewMeter(PrometheusCompat(true))
+	m.Histogram("foo", "key", "val").Update(15)
+
+	buf := bytes.NewBuffer(nil)
+
+	_ = m.Write(buf)
+	t.Logf("\n%s", buf.Bytes())
+}