fixup v3

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

.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: For reporting bugs in go-micro
+about: For reporting bugs in micro
 title: "[BUG]"
 labels: ''
 assignees: ''
@@ -16,9 +16,3 @@ assignees: ''
 **How to reproduce the bug:**
 
 If possible, please include a minimal code snippet here.
-
-**Environment:**
-Go Version: please paste `go version` output here
-```
-please paste `go env` output here
-```

.gitea/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -1,6 +1,6 @@
 ---
 name: Feature request / Enhancement
-about: If you have a need not served by go-micro
+about: If you have a need not served by micro
 title: "[FEATURE]"
 labels: ''
 assignees: ''
@@ -14,4 +14,4 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 A clear and concise description of what you want to happen.
 
 **Additional context**
-Add any other context or screenshots about the feature request here.
+Add any other context or screenshots about the feature request here.

.gitea/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,8 @@
+---
+name: Question
+about: Ask a question about micro
+title: ''
+labels: ''
+assignees: ''
+
+---

.gitea/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable' 
+    - name: setup deps
+      run: go get -v ./...
+    - name: run lint
+      uses: https://github.com/golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.gitea/workflows/job_test.yml

@@ -0,0 +1,34 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.gitea/workflows/job_tests.yml

@@ -0,0 +1,53 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: checkout tests
+      uses: actions/checkout@v4
+      with:
+        ref: master
+        filter: 'blob:none'
+        repository: unistack-org/micro-tests
+        path: micro-tests
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup go work
+      env:
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests
+    - name: setup deps
+      env:
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true

.github/ISSUE_TEMPLATE/question.md

@@ -1,14 +0,0 @@
----
-name: Question
-about: Ask a question about go-micro
-title: ''
-labels: ''
-assignees: ''
-
----
-
-Before asking, please check if your question has already been answered: 
-
-1. Check the documentation - https://micro.mu/docs/
-2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
-3. Search existing issues

.github/dependabot.yml

@@ -1,19 +0,0 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
-version: 2
-updates:
-
-  # Maintain dependencies for GitHub Actions
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-
-  # Maintain dependencies for Golang
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "daily"

.github/workflows/build.yml

@@ -1,46 +0,0 @@
-name: build
-on:
- push:
-    branches:
-    - master
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    - name: checkout
-      uses: actions/checkout@v2
-    - name: cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: lint
-        uses: golangci/golangci-lint-action@v2
-        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.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.github/workflows/codeql-analysis.yml

@@ -1,78 +0,0 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
-name: "codeql"
-
-on:
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
-  push:
-    branches: [ master, v3 ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ master, v3 ]
-  schedule:
-    - cron: '34 1 * * 0'
-
-jobs:
-  analyze:
-    name: analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'go' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
-        # Learn more:
-        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
-
-    steps:
-    - name: checkout
-      uses: actions/checkout@v2
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    # Initializes the CodeQL tools for scanning.
-    - name: init
-      uses: github/codeql-action/init@v1
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
-
-    # 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
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: analyze
-      uses: github/codeql-action/analyze@v1

.github/workflows/dependabot-automerge.yml

@@ -1,31 +0,0 @@
-name: "prautomerge"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  dependabot:
-    runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
-    steps:
-      - name: metadata
-        id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
-        with:
-          github-token: "${{ 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
-        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/pr.yml

@@ -1,46 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    - name: checkout
-      uses: actions/checkout@v2
-    - name: cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: lint
-        uses: golangci/golangci-lint-action@v2
-        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.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.golangci.yml

@@ -0,0 +1,5 @@
+run:
+  concurrency: 8
+  deadline: 5m
+  issues-exit-code: 1
+  tests: true

go.mod

@@ -1,10 +1,20 @@
 module go.unistack.org/micro-meter-prometheus/v3
 
-go 1.16
+go 1.22.0
+
 
 require (
-	github.com/prometheus/client_golang v1.11.0
-	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.26.0
-	go.unistack.org/micro/v3 v3.8.7
+	github.com/prometheus/client_golang v1.21.0
+	github.com/prometheus/client_model v0.6.1
+	github.com/prometheus/common v0.62.0
+	go.unistack.org/micro/v3 v3.11.41
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
 )

go.sum

@@ -1,156 +1,32 @@
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-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=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
-github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
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-github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
-github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
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-github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
-github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
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-github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
+google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

prometheus.go

@@ -2,7 +2,9 @@ package prometheus
 
 import (
 	"fmt"
+	"hash/fnv"
 	"io"
+	"regexp"
 	"sync"
 	"time"
 
@@ -13,34 +15,64 @@ import (
 	"go.unistack.org/micro/v3/meter"
 )
 
+var _ meter.Meter = &prometheusMeter{}
+
 type prometheusMeter struct {
 	opts         meter.Options
 	set          prometheus.Registerer
-	counter      map[string]prometheusCounter
-	floatCounter map[string]prometheusFloatCounter
-	gauge        map[string]prometheusGauge
-	histogram    map[string]prometheusHistogram
-	summary      map[string]prometheusSummary
+	counter      map[string]*counters
+	floatCounter map[string]*floatCounters
+	gauge        map[string]*gauges
+	histogram    map[string]*histograms
+	summary      map[string]*summaries
 	sync.Mutex
 }
 
-func NewMeter(opts ...meter.Option) meter.Meter {
+type counters struct {
+	cs map[uint64]*prometheusCounter
+}
+
+type gauges struct {
+	cs map[uint64]*prometheusGauge
+}
+
+type histograms struct {
+	cs map[uint64]*prometheusHistogram
+}
+
+type summaries struct {
+	cs map[uint64]*prometheusSummary
+}
+
+type floatCounters struct {
+	cs map[uint64]*prometheusFloatCounter
+}
+
+/*
+func newFloat64(v float64) *float64 {
+	nv := v
+	return &nv
+}
+*/
+
+func newString(v string) *string {
+	nv := v
+	return &nv
+}
+
+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),
-		floatCounter: make(map[string]prometheusFloatCounter),
-		gauge:        make(map[string]prometheusGauge),
-		histogram:    make(map[string]prometheusHistogram),
-		summary:      make(map[string]prometheusSummary),
+		counter:      make(map[string]*counters),
+		floatCounter: make(map[string]*floatCounters),
+		gauge:        make(map[string]*gauges),
+		histogram:    make(map[string]*histograms),
+		summary:      make(map[string]*summaries),
 	}
 }
 
 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
@@ -50,153 +82,156 @@ func (m *prometheusMeter) buildMetric(name string, labels ...string) string {
 	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()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.counter[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.counter[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusCounter{c: nc}
-		m.counter[nm] = c
+		cd = &counters{cs: make(map[uint64]*prometheusCounter)}
+		c := &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.counter[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.counter[nm] = cd
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
 	m.Lock()
 	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.floatCounter[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.floatCounter[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusFloatCounter{c: nc}
-		m.floatCounter[nm] = c
+		cd = &floatCounters{cs: make(map[uint64]*prometheusFloatCounter)}
+		c := &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.floatCounter[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.floatCounter[nm] = cd
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
 	m.Lock()
 	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.gauge[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.gauge[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusGauge{c: nc}
-		m.gauge[nm] = c
+		cd = &gauges{cs: make(map[uint64]*prometheusGauge)}
+		c := &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.gauge[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.gauge[nm] = cd
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
 	m.Lock()
 	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.histogram[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.histogram[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewHistogram(prometheus.HistogramOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusHistogram{c: nc}
-		m.histogram[nm] = c
+		cd = &histograms{cs: make(map[uint64]*prometheusHistogram)}
+		c := &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.histogram[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.histogram[nm] = cd
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
 	m.Lock()
 	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.summary[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.summary[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusSummary{c: nc}
-		m.summary[nm] = c
+		cd = &summaries{cs: make(map[uint64]*prometheusSummary)}
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.summary[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: nm}), labels: labels}
+		cd.cs[h] = c
+		m.summary[nm] = cd
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) meter.Summary {
 	m.Lock()
 	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.summary[nm]
+	nm := m.buildMetric(name)
+	labels = append(m.opts.Labels, labels...)
+	cd, ok := m.summary[nm]
+	h := newHash(labels)
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{
-			Name:        m.buildName(name),
-			ConstLabels: m.mapLabels(labels...),
-			MaxAge:      window,
-			Objectives:  map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		})
-		m.set.MustRegister(nc)
-		c = prometheusSummary{c: nc}
-		m.summary[nm] = c
+		cd = &summaries{cs: make(map[uint64]*prometheusSummary)}
+		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
+			Name:       nm,
+			MaxAge:     window,
+			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+		}), labels: labels}
+		cd.cs[h] = c
+		m.summary[nm] = cd
+		return c
+	}
+	c, ok := cd.cs[h]
+	if !ok {
+		c = &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
+			Name:       nm,
+			MaxAge:     window,
+			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+		}), labels: labels}
+		cd.cs[h] = c
+		m.summary[nm] = cd
 	}
-
 	return c
 }
 
@@ -204,7 +239,6 @@ func (m *prometheusMeter) Init(opts ...meter.Option) error {
 	for _, o := range opts {
 		o(&m.opts)
 	}
-
 	return nil
 }
 
@@ -215,8 +249,10 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 	}
 
 	if options.WriteProcessMetrics || options.WriteFDMetrics {
-		c := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
-		_ = m.set.Register(c)
+		pc := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
+		_ = m.set.Register(pc)
+		gc := collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}))
+		_ = m.set.Register(gc)
 	}
 
 	g, ok := m.set.(prometheus.Gatherer)
@@ -229,7 +265,83 @@ 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))
+
+	for name, metrics := range m.counter {
+		mf := &dto.MetricFamily{
+			Name:   newString(name),
+			Type:   dto.MetricType_GAUGE.Enum(),
+			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
+		}
+		for _, c := range metrics.cs {
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+		}
+		mfs = append(mfs, mf)
+	}
+
+	for name, metrics := range m.gauge {
+		mf := &dto.MetricFamily{
+			Name:   newString(name),
+			Type:   dto.MetricType_GAUGE.Enum(),
+			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
+		}
+		for _, c := range metrics.cs {
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+		}
+		mfs = append(mfs, mf)
+	}
+
+	for name, metrics := range m.floatCounter {
+		mf := &dto.MetricFamily{
+			Name:   newString(name),
+			Type:   dto.MetricType_GAUGE.Enum(),
+			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
+		}
+		for _, c := range metrics.cs {
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+		}
+		mfs = append(mfs, mf)
+	}
+
+	for name, metrics := range m.histogram {
+		mf := &dto.MetricFamily{
+			Name:   newString(name),
+			Type:   dto.MetricType_HISTOGRAM.Enum(),
+			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
+		}
+		for _, c := range metrics.cs {
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+		}
+		mfs = append(mfs, mf)
+	}
+
+	for name, metrics := range m.summary {
+		mf := &dto.MetricFamily{
+			Name:   newString(name),
+			Type:   dto.MetricType_SUMMARY.Enum(),
+			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
+		}
+		for _, c := range metrics.cs {
+			m := &dto.Metric{}
+			_ = c.c.Write(m)
+			fillMetric(m, c.labels)
+			mf.Metric = append(mf.Metric, m)
+		}
+		mfs = append(mfs, mf)
+	}
+
 	for _, mf := range mfs {
 		_ = enc.Encode(mf)
 	}
@@ -248,12 +360,13 @@ func (m *prometheusMeter) Clone(opts ...meter.Option) meter.Meter {
 	}
 
 	return &prometheusMeter{
-		set:       m.set,
-		opts:      options,
-		counter:   m.counter,
-		gauge:     m.gauge,
-		histogram: m.histogram,
-		summary:   m.summary,
+		set:          m.set,
+		opts:         options,
+		floatCounter: m.floatCounter,
+		counter:      m.counter,
+		gauge:        m.gauge,
+		histogram:    m.histogram,
+		summary:      m.summary,
 	}
 }
 
@@ -275,22 +388,23 @@ func (m *prometheusMeter) Set(opts ...meter.Option) meter.Meter {
 }
 
 type prometheusCounter struct {
-	c prometheus.Gauge
+	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 +412,13 @@ 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
+	c      prometheus.Gauge
+	labels []string
 }
 
 func (c prometheusFloatCounter) Add(n float64) {
@@ -327,7 +442,8 @@ func (c prometheusFloatCounter) Sub(n float64) {
 }
 
 type prometheusGauge struct {
-	c prometheus.Gauge
+	c      prometheus.Gauge
+	labels []string
 }
 
 func (c prometheusGauge) Get() float64 {
@@ -339,7 +455,8 @@ func (c prometheusGauge) Get() float64 {
 }
 
 type prometheusHistogram struct {
-	c prometheus.Histogram
+	c      prometheus.Histogram
+	labels []string
 }
 
 func (c prometheusHistogram) Reset() {
@@ -354,7 +471,8 @@ func (c prometheusHistogram) UpdateDuration(n time.Time) {
 }
 
 type prometheusSummary struct {
-	c prometheus.Summary
+	c      prometheus.Summary
+	labels []string
 }
 
 func (c prometheusSummary) Update(n float64) {
@@ -364,3 +482,22 @@ 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 {
+	h := fnv.New64a()
+	for _, l := range labels {
+		h.Write([]byte(l))
+	}
+	return h.Sum64()
+}
+
+func fillMetric(m *dto.Metric, labels []string) *dto.Metric {
+	m.Label = make([]*dto.LabelPair, 0, len(labels)/2)
+	for idx := 0; idx < len(labels); idx += 2 {
+		m.Label = append(m.Label, &dto.LabelPair{
+			Name:  newString(labels[idx]),
+			Value: newString(labels[idx+1]),
+		})
+	}
+	return m
+}

prometheus_test.go

@@ -2,20 +2,28 @@ package prometheus
 
 import (
 	"bytes"
-	"context"
+	"fmt"
 	"testing"
 
-	"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 TestStd(t *testing.T) {
+	m := NewMeter(meter.WriteProcessMetrics(true), meter.WriteFDMetrics(true))
+	if err := m.Init(); err != nil {
+		t.Fatal(err)
+	}
+	buf := bytes.NewBuffer(nil)
+	_ = m.Write(buf)
+	if !bytes.Contains(buf.Bytes(), []byte(`go_goroutine`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
+}
+
 func TestBuildName(t *testing.T) {
 	m := NewMeter()
-	im := m.(*prometheusMeter)
-	check := `micro_foo{micro_aaa="b",micro_bar="baz",micro_ccc="d"}`
-	name := im.buildMetric("foo", "bar", "baz", "aaa", "b", "ccc", "d")
+	check := `micro_foo{aaa="b",bar="baz",ccc="d"}`
+	name := m.buildMetric("micro_foo", "bar", "baz", "aaa", "b", "ccc", "d")
 	if name != check {
 		t.Fatalf("metric name error: %s != %s", name, check)
 	}
@@ -24,29 +32,45 @@ func TestBuildName(t *testing.T) {
 	cnt.Inc()
 }
 
-func TestWrapper(t *testing.T) {
+func TestMultiple(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),
-	)
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
 
-	ctx := context.Background()
+	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()
 
-	c := client.NewClient(client.Wrap(w))
-	if err := c.Init(); err != nil {
-		t.Fatal(err)
-	}
-	rsp := &codec.Frame{}
-	req := &codec.Frame{}
-	err := c.Call(ctx, c.NewRequest("svc2", "Service.Method", req), rsp)
-	_, _ = 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_server{endpoint="ep1",path="/path1"} 2`)) {
+		// t.Fatal("XXXX")
 		t.Fatalf("invalid metrics output: %s", buf.Bytes())
 	}
 }
+
+func TestCounterSet(t *testing.T) {
+	m := NewMeter()
+
+	value := uint64(42)
+
+	m.Counter("forte_accounts_total", "channel_code", "crm").Set(value)
+
+	fmt.Println(uint64(float64(value)))
+
+	buf := bytes.NewBuffer(nil)
+
+	_ = m.Write(buf)
+
+	output := buf.String()
+
+	fmt.Println(output)
+
+	expectedOutput := fmt.Sprintf(`%s{channel_code="crm"} %d`, "forte_accounts_total", value)
+
+	if !bytes.Contains(buf.Bytes(), []byte(expectedOutput)) {
+		t.Fatalf("invalid metrics output: expected %q, got %q", expectedOutput, output)
+	}
+}