update deps, minimise memory allocations

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

.github/workflows/autoapprove.yml

@@ -0,0 +1,20 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -3,19 +3,20 @@ on:
  push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/codeql-analysis.yml

@@ -43,14 +43,14 @@ jobs:
 
     steps:
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     # Initializes the CodeQL tools for scanning.
     - name: init
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@v2
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -61,7 +61,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: autobuild
-      uses: github/codeql-action/autobuild@v1
+      uses: github/codeql-action/autobuild@v2
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -75,4 +75,4 @@ jobs:
     #   make release
 
     - name: analyze
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -1,4 +1,4 @@
-name: "prautomerge"
+name: "dependabot-automerge"
 
 on:
   pull_request_target:
@@ -9,21 +9,17 @@ permissions:
   contents: write
 
 jobs:
-  dependabot:
+  automerge:
     runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: github.actor == 'dependabot[bot]'
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
+        uses: dependabot/fetch-metadata@v1.3.6
         with:
           github-token: "${{ secrets.TOKEN }}"
-      - name: approve
-        run: gh pr review --approve "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}
       - name: merge
+        id: merge
         if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
         run: gh pr merge --auto --merge "$PR_URL"
         env:

.github/workflows/pr.yml

@@ -3,19 +3,20 @@ on:
   pull_request:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

go.mod

@@ -1,10 +1,25 @@
 module go.unistack.org/micro-meter-prometheus/v3
 
-go 1.16
+go 1.21
+
+toolchain go1.22.0
 
 require (
-	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/client_golang v1.20.4
-	github.com/prometheus/client_model v0.2.0
+	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.26.0
+	github.com/prometheus/common v0.59.1
-	go.unistack.org/micro/v3 v3.8.7
+	go.unistack.org/micro/v3 v3.10.91
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	go.unistack.org/micro-proto/v3 v3.4.1 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect
+	google.golang.org/grpc v1.57.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 )

go.sum

@@ -1,156 +1,46 @@
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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prometheus.go

@@ -2,7 +2,9 @@ package prometheus
 
 import (
 	"fmt"
+	"hash/fnv"
 	"io"
+	"regexp"
 	"sync"
 	"time"
 
@@ -13,190 +15,210 @@ import (
 	"go.unistack.org/micro/v3/meter"
 )
 
+var _ meter.Meter = (*prometheusMeter)(nil)
+
 type prometheusMeter struct {
 	opts         meter.Options
 	set          prometheus.Registerer
-	counter      map[string]prometheusCounter
+	counter      *sync.Map
-	floatCounter map[string]prometheusFloatCounter
+	floatCounter *sync.Map
-	gauge        map[string]prometheusGauge
+	gauge        *sync.Map
-	histogram    map[string]prometheusHistogram
+	histogram    *sync.Map
-	summary      map[string]prometheusSummary
+	summary      *sync.Map
 	sync.Mutex
 }
 
-func NewMeter(opts ...meter.Option) meter.Meter {
+type counters struct {
+	cs *sync.Map
+}
+
+type gauges struct {
+	cs *sync.Map
+}
+
+type histograms struct {
+	cs *sync.Map
+}
+
+type summaries struct {
+	cs *sync.Map
+}
+
+type floatCounters struct {
+	cs *sync.Map
+}
+
+func NewMeter(opts ...meter.Option) *prometheusMeter {
 	return &prometheusMeter{
-		set:          prometheus.DefaultRegisterer,
+		set:          prometheus.NewRegistry(), // prometheus.DefaultRegisterer,
 		opts:         meter.NewOptions(opts...),
-		counter:      make(map[string]prometheusCounter),
+		counter:      &sync.Map{},
-		floatCounter: make(map[string]prometheusFloatCounter),
+		floatCounter: &sync.Map{},
-		gauge:        make(map[string]prometheusGauge),
+		gauge:        &sync.Map{},
-		histogram:    make(map[string]prometheusHistogram),
+		histogram:    &sync.Map{},
-		summary:      make(map[string]prometheusSummary),
+		summary:      &sync.Map{},
 	}
 }
 
-func (m *prometheusMeter) buildMetric(name string, labels ...string) string {
-	if len(m.opts.MetricPrefix) > 0 {
-		name = m.opts.MetricPrefix + name
-	}
-
-	nl := len(m.opts.Labels) + len(labels)
-	if nl == 0 {
-		return name
-	}
-
-	nlabels := make([]string, 0, nl)
-	nlabels = append(nlabels, m.opts.Labels...)
-	nlabels = append(nlabels, labels...)
-
-	if len(m.opts.LabelPrefix) == 0 {
-		return meter.BuildName(name, nlabels...)
-	}
-
-	for idx := 0; idx < nl; idx++ {
-		nlabels[idx] = m.opts.LabelPrefix + nlabels[idx]
-		idx++
-	}
-	return meter.BuildName(name, nlabels...)
-}
-
-func (m *prometheusMeter) buildName(name string) string {
-	if len(m.opts.MetricPrefix) > 0 {
-		name = m.opts.MetricPrefix + name
-	}
-	return name
-}
-
-func (m *prometheusMeter) buildLabels(labels ...string) []string {
-	nl := len(m.opts.Labels) + len(labels)
-	if nl == 0 {
-		return nil
-	}
-
-	nlabels := make([]string, 0, nl)
-	nlabels = append(nlabels, m.opts.Labels...)
-	nlabels = append(nlabels, labels...)
-
-	for idx := 0; idx < nl; idx++ {
-		nlabels[idx] = m.opts.LabelPrefix + nlabels[idx]
-		idx++
-	}
-	return nlabels
-}
-
 func (m *prometheusMeter) Name() string {
 	return m.opts.Name
 }
 
-func (m *prometheusMeter) mapLabels(labels ...string) map[string]string {
-	labels = m.buildLabels(labels...)
-	elementMap := make(map[string]string, len(labels)/2)
-	for idx := 0; idx < len(labels); idx++ {
-		elementMap[labels[idx]] = labels[idx+1]
-		idx++
-	}
-	return elementMap
-}
-
 func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.counter.Load(name)
-	c, ok := m.counter[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
+		cd := &counters{cs: &sync.Map{}}
-		m.set.MustRegister(nc)
+		c := &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
-		c = prometheusCounter{c: nc}
+		cd.cs.Store(h, c)
-		m.counter[nm] = c
+		m.counter.Store(name, cd)
+		return c
 	}
-
+	cd := vcd.(*counters)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
+		cd.cs.Store(h, c)
+		m.counter.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusCounter)
 	return c
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.floatCounter.Load(name)
-	c, ok := m.floatCounter[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
+		cd := &floatCounters{cs: &sync.Map{}}
-		m.set.MustRegister(nc)
+		c := &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
-		c = prometheusFloatCounter{c: nc}
+		cd.cs.Store(h, c)
-		m.floatCounter[nm] = c
+		m.floatCounter.Store(name, cd)
+		return c
 	}
-
+	cd := vcd.(*floatCounters)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
+		cd.cs.Store(h, c)
+		m.floatCounter.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusFloatCounter)
 	return c
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.gauge.Load(name)
-	c, ok := m.gauge[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
+		cd := &gauges{cs: &sync.Map{}}
-		m.set.MustRegister(nc)
+		c := &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
-		c = prometheusGauge{c: nc}
+		cd.cs.Store(h, c)
-		m.gauge[nm] = c
+		m.gauge.Store(name, cd)
+		return c
 	}
-
+	cd := vcd.(*gauges)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: name}), labels: labels}
+		cd.cs.Store(h, c)
+		m.gauge.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusGauge)
 	return c
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.histogram.Load(name)
-	c, ok := m.histogram[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewHistogram(prometheus.HistogramOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
+		cd := &histograms{cs: &sync.Map{}}
-		m.set.MustRegister(nc)
+		c := &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: name}), labels: labels}
-		c = prometheusHistogram{c: nc}
+		cd.cs.Store(h, c)
-		m.histogram[nm] = c
+		m.histogram.Store(name, cd)
+		return c
 	}
-
+	cd := vcd.(*histograms)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: name}), labels: labels}
+		cd.cs.Store(h, c)
+		m.histogram.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusHistogram)
 	return c
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.summary.Load(name)
-	c, ok := m.summary[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
+		cd := &summaries{cs: &sync.Map{}}
-		m.set.MustRegister(nc)
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: name}), labels: labels}
-		c = prometheusSummary{c: nc}
+		cd.cs.Store(h, c)
-		m.summary[nm] = c
+		m.summary.Store(name, cd)
+		return c
 	}
-
+	cd := vcd.(*summaries)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: name}), labels: labels}
+		cd.cs.Store(h, c)
+		m.summary.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusSummary)
 	return c
 }
 
 func (m *prometheusMeter) SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) meter.Summary {
 	m.Lock()
 	defer m.Unlock()
-
+	labels = append(m.opts.Labels, labels...)
-	nm := m.buildMetric(name, labels...)
+	vcd, ok := m.summary.Load(name)
-	c, ok := m.summary[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{
+		cd := &summaries{cs: &sync.Map{}}
-			Name:        m.buildName(name),
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
-			ConstLabels: m.mapLabels(labels...),
+			Name:       name,
 			MaxAge:     window,
 			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		})
+		}), labels: labels}
-		m.set.MustRegister(nc)
+		cd.cs.Store(h, c)
-		c = prometheusSummary{c: nc}
+		m.summary.Store(name, cd)
-		m.summary[nm] = c
+		return c
 	}
-
+	cd := vcd.(*summaries)
+	vc, ok := cd.cs.Load(h)
+	if !ok {
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
+			Name:       name,
+			MaxAge:     window,
+			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+		}), labels: labels}
+		cd.cs.Store(h, c)
+		m.summary.Store(name, cd)
+		return c
+	}
+	c := vc.(*prometheusSummary)
 	return c
 }
 
@@ -205,6 +227,13 @@ func (m *prometheusMeter) Init(opts ...meter.Option) error {
 		o(&m.opts)
 	}
 
+	if m.opts.WriteProcessMetrics || m.opts.WriteFDMetrics {
+		pc := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
+		_ = m.set.Register(pc)
+		gc := collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}))
+		_ = m.set.Register(gc)
+	}
+
 	return nil
 }
 
@@ -214,11 +243,6 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		o(&options)
 	}
 
-	if options.WriteProcessMetrics || options.WriteFDMetrics {
-		c := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
-		_ = m.set.Register(c)
-	}
-
 	g, ok := m.set.(prometheus.Gatherer)
 	if !ok {
 		return fmt.Errorf("set type %T not prometheus.Gatherer", m.set)
@@ -229,7 +253,98 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		return err
 	}
 
-	enc := expfmt.NewEncoder(w, expfmt.FmtText)
+	enc := expfmt.NewEncoder(w, expfmt.NewFormat(expfmt.TypeTextPlain))
+
+	m.counter.Range(func(k, v any) bool {
+		name := k.(string)
+		mf := &dto.MetricFamily{
+			Name: &name,
+			Type: dto.MetricType_GAUGE.Enum(),
+		}
+		v.(*counters).cs.Range(func(_, nv any) bool {
+			c := nv.(*prometheusCounter)
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+			return true
+		})
+		mfs = append(mfs, mf)
+		return true
+	})
+
+	m.gauge.Range(func(k, v any) bool {
+		name := k.(string)
+		mf := &dto.MetricFamily{
+			Name: &name,
+			Type: dto.MetricType_GAUGE.Enum(),
+		}
+		v.(*gauges).cs.Range(func(_, nv any) bool {
+			c := nv.(*prometheusGauge)
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+			return true
+		})
+		mfs = append(mfs, mf)
+		return true
+	})
+
+	m.floatCounter.Range(func(k, v any) bool {
+		name := k.(string)
+		mf := &dto.MetricFamily{
+			Name: &name,
+			Type: dto.MetricType_GAUGE.Enum(),
+		}
+		v.(*floatCounters).cs.Range(func(_, nv any) bool {
+			c := nv.(*prometheusFloatCounter)
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+			return true
+		})
+		mfs = append(mfs, mf)
+		return true
+	})
+
+	m.histogram.Range(func(k, v any) bool {
+		name := k.(string)
+		mf := &dto.MetricFamily{
+			Name: &name,
+			Type: dto.MetricType_HISTOGRAM.Enum(),
+		}
+		v.(*histograms).cs.Range(func(_, nv any) bool {
+			c := nv.(*prometheusHistogram)
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+			return true
+		})
+		mfs = append(mfs, mf)
+		return true
+	})
+
+	m.summary.Range(func(k, v any) bool {
+		name := k.(string)
+		mf := &dto.MetricFamily{
+			Name: &name,
+			Type: dto.MetricType_SUMMARY.Enum(),
+		}
+		v.(*summaries).cs.Range(func(_, nv any) bool {
+			c := nv.(*prometheusSummary)
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+			return true
+		})
+		mfs = append(mfs, mf)
+		return true
+	})
+
 	for _, mf := range mfs {
 		_ = enc.Encode(mf)
 	}
@@ -250,6 +365,7 @@ func (m *prometheusMeter) Clone(opts ...meter.Option) meter.Meter {
 	return &prometheusMeter{
 		set:          m.set,
 		opts:         options,
+		floatCounter: m.floatCounter,
 		counter:      m.counter,
 		gauge:        m.gauge,
 		histogram:    m.histogram,
@@ -276,21 +392,22 @@ func (m *prometheusMeter) Set(opts ...meter.Option) meter.Meter {
 
 type prometheusCounter struct {
 	c      prometheus.Gauge
+	labels []string
 }
 
-func (c prometheusCounter) Add(n int) {
+func (c *prometheusCounter) Add(n int) {
 	c.c.Add(float64(n))
 }
 
-func (c prometheusCounter) Dec() {
+func (c *prometheusCounter) Dec() {
 	c.c.Dec()
 }
 
-func (c prometheusCounter) Inc() {
+func (c *prometheusCounter) Inc() {
 	c.c.Inc()
 }
 
-func (c prometheusCounter) Get() uint64 {
+func (c *prometheusCounter) Get() uint64 {
 	m := &dto.Metric{}
 	if err := c.c.Write(m); err != nil {
 		return 0
@@ -298,12 +415,13 @@ func (c prometheusCounter) Get() uint64 {
 	return uint64(m.GetGauge().GetValue())
 }
 
-func (c prometheusCounter) Set(n uint64) {
+func (c *prometheusCounter) Set(n uint64) {
 	c.c.Set(float64(n))
 }
 
 type prometheusFloatCounter struct {
 	c      prometheus.Gauge
+	labels []string
 }
 
 func (c prometheusFloatCounter) Add(n float64) {
@@ -328,6 +446,7 @@ func (c prometheusFloatCounter) Sub(n float64) {
 
 type prometheusGauge struct {
 	c      prometheus.Gauge
+	labels []string
 }
 
 func (c prometheusGauge) Get() float64 {
@@ -340,6 +459,7 @@ func (c prometheusGauge) Get() float64 {
 
 type prometheusHistogram struct {
 	c      prometheus.Histogram
+	labels []string
 }
 
 func (c prometheusHistogram) Reset() {
@@ -355,6 +475,7 @@ func (c prometheusHistogram) UpdateDuration(n time.Time) {
 
 type prometheusSummary struct {
 	c      prometheus.Summary
+	labels []string
 }
 
 func (c prometheusSummary) Update(n float64) {
@@ -364,3 +485,29 @@ func (c prometheusSummary) Update(n float64) {
 func (c prometheusSummary) UpdateDuration(n time.Time) {
 	c.c.Observe(time.Since(n).Seconds())
 }
+
+func newHash(labels []string) uint64 {
+	labels = meter.BuildLabels(labels...)
+	h := fnv.New64a()
+	for _, l := range labels {
+		h.Write([]byte(l))
+	}
+	return h.Sum64()
+}
+
+func fillMetric(m *dto.Metric, labels []string) *dto.Metric {
+	var ok bool
+	seen := make(map[string]bool, len(labels)/2)
+	m.Label = make([]*dto.LabelPair, 0, len(labels)/2)
+	for idx := 0; idx < len(labels); idx += 2 {
+		if _, ok = seen[labels[idx]]; ok {
+			continue
+		}
+		m.Label = append(m.Label, &dto.LabelPair{
+			Name:  &(labels[idx]),
+			Value: &(labels[idx+1]),
+		})
+		seen[labels[idx]] = true
+	}
+	return m
+}

prometheus_test.go

@@ -8,35 +8,26 @@ import (
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/meter/wrapper"
 )
 
-func TestBuildName(t *testing.T) {
+func TestStd(t *testing.T) {
-	m := NewMeter()
+	m := NewMeter(meter.WriteProcessMetrics(true), meter.WriteFDMetrics(true))
-	im := m.(*prometheusMeter)
+	if err := m.Init(); err != nil {
-	check := `micro_foo{micro_aaa="b",micro_bar="baz",micro_ccc="d"}`
+		t.Fatal(err)
-	name := im.buildMetric("foo", "bar", "baz", "aaa", "b", "ccc", "d")
+	}
-	if name != check {
+	buf := bytes.NewBuffer(nil)
-		t.Fatalf("metric name error: %s != %s", name, check)
+	_ = m.Write(buf)
+	if !bytes.Contains(buf.Bytes(), []byte(`go_goroutine`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
 	}
-
-	cnt := m.Counter("counter", "key", "val")
-	cnt.Inc()
 }
 
 func TestWrapper(t *testing.T) {
 	m := NewMeter() // meter.Labels("test_key", "test_val"))
 
-	w := wrapper.NewClientWrapper(
-		wrapper.ServiceName("svc1"),
-		wrapper.ServiceVersion("0.0.1"),
-		wrapper.ServiceID("12345"),
-		wrapper.Meter(m),
-	)
-
 	ctx := context.Background()
 
-	c := client.NewClient(client.Wrap(w))
+	c := client.NewClient(client.Meter(m))
 	if err := c.Init(); err != nil {
 		t.Fatal(err)
 	}
@@ -46,7 +37,26 @@ func TestWrapper(t *testing.T) {
 	_, _ = rsp, err
 	buf := bytes.NewBuffer(nil)
 	_ = m.Write(buf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
-	if !bytes.Contains(buf.Bytes(), []byte(`micro_client_request_inflight{micro_endpoint="svc2.Service.Method"} 0`)) {
+	if !bytes.Contains(buf.Bytes(), []byte(`micro_client_request_inflight{endpoint="Service.Method"} 0`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
+}
+
+func TestMultiple(t *testing.T) {
+	m := NewMeter() // meter.Labels("test_key", "test_val"))
+
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
+
+	m.Counter("micro_server", "endpoint", "ep2", "path", "/path2").Inc()
+	m.Counter("micro_server", "endpoint", "ep2", "path", "/path2").Inc()
+
+	m.Counter("micro_server", "endpoint", "ep3", "path", "/path3", "status", "success").Inc()
+
+	buf := bytes.NewBuffer(nil)
+	_ = m.Write(buf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
+	if !bytes.Contains(buf.Bytes(), []byte(`micro_server{endpoint="ep1",path="/path1"} 2`)) {
+		// t.Fatal("XXXX")
 		t.Fatalf("invalid metrics output: %s", buf.Bytes())
 	}
 }