go.opentelemetry.io/otel/metric v1.38.0: MeterProvider

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify metric.MeterProvider in pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0
Demonstrate these symbols/APIs:
  - metric.MeterProvider

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:f4c77f20c51cff0c8749ede4b575a9fc070c508957c34fdcb42203166b83f346","contract":["A struct embedding embedded.MeterProvider and implementing Meter(name string, opts ...metric.MeterOption) metric.Meter satisfies metric.MeterProvider","MeterProvider.Meter forwards MeterOption values into metric.NewMeterConfig, preserving WithInstrumentationVersion, WithSchemaURL, and WithInstrumentationAttributes","noop.NewMeterProvider returns a metric.MeterProvider whose Meter creates functional synchronous instruments such as Int64Counter"],"goal":"verify metric.MeterProvider in pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0"],"schemaVersion":1,"symbols":["metric.MeterProvider"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0","symbols":["metric.MeterProvider"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.24.0

require (
	go.opentelemetry.io/otel v1.38.0
	go.opentelemetry.io/otel/metric v1.38.0
)

github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
go.opentelemetry.io/otel v1.38.0 h1:RkfdswUDRimDg0m2Az18RKOsnI8UDzppJAtj01/Ymk8=
go.opentelemetry.io/otel v1.38.0/go.mod h1:zcmtmQ1+YmQM9wrNsTGV/q/uyusom3P8RxwExxkZhjM=
go.opentelemetry.io/otel/metric v1.38.0 h1:Kl6lzIYGAh5M159u9NgiRkmoMKjvbsKtYRwgfrA6WpA=
go.opentelemetry.io/otel/metric v1.38.0/go.mod h1:kB5n/QoRM8YwmUahxvI3bO34eVtQf2i4utNVLr9gEmI=
go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJrmcNLE=
go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "verify metric.MeterProvider in pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/metric@v1.38.0"
  ],
  "symbols": [
    "metric.MeterProvider"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/metric"
	"go.opentelemetry.io/otel/metric/embedded"
	"go.opentelemetry.io/otel/metric/noop"
)

type recordingMeterProvider struct {
	embedded.MeterProvider
	delegate   metric.MeterProvider
	meterNames []string
	configs    []metric.MeterConfig
}

func (p *recordingMeterProvider) Meter(name string, opts ...metric.MeterOption) metric.Meter {
	p.meterNames = append(p.meterNames, name)
	p.configs = append(p.configs, metric.NewMeterConfig(opts...))
	return p.delegate.Meter(name, opts...)
}

func main() {
	base := noop.NewMeterProvider()
	rec := &recordingMeterProvider{delegate: base}
	var provider metric.MeterProvider = rec

	attr := attribute.String("service.tier", "backend")
	meter := provider.Meter(
		"example.com/telemetry",
		metric.WithInstrumentationVersion("2.1.0"),
		metric.WithSchemaURL("https://example.com/schemas/2.1.0"),
		metric.WithInstrumentationAttributes(attr),
	)
	if meter == nil {
		fmt.Fprintln(os.Stderr, "expected non-nil metric.Meter from MeterProvider.Meter")
		os.Exit(1)
	}

	if len(rec.meterNames) != 1 || rec.meterNames[0] != "example.com/telemetry" {
		fmt.Fprintf(os.Stderr, "unexpected meterNames: %v\n", rec.meterNames)
		os.Exit(1)
	}

	cfg := rec.configs[0]
	if cfg.InstrumentationVersion() != "2.1.0" {
		fmt.Fprintf(os.Stderr, "expected version 2.1.0, got %q\n", cfg.InstrumentationVersion())
		os.Exit(1)
	}
	if cfg.SchemaURL() != "https://example.com/schemas/2.1.0" {
		fmt.Fprintf(os.Stderr, "expected schema URL, got %q\n", cfg.SchemaURL())
		os.Exit(1)
	}
	attrs := cfg.InstrumentationAttributes()
	val, ok := attrs.Value("service.tier")
	if !ok || val.AsString() != "backend" {
		fmt.Fprintf(os.Stderr, "expected attribute service.tier=backend, got %v (ok=%v)\n", val, ok)
		os.Exit(1)
	}

	counter, err := meter.Int64Counter("items.processed")
	if err != nil || counter == nil {
		fmt.Fprintf(os.Stderr, "Int64Counter failed: %v\n", err)
		os.Exit(1)
	}
	counter.Add(context.Background(), 1)
}