go.opentelemetry.io/otel/sdk/metric v1.42.0

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 pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0

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:af4e13f840f73eeef35905689c719473dc4ab48054eb4bccf04b9464e0ffc78e","contract":["metric.NewMeterProvider creates a non-nil *MeterProvider instance with default settings","metric.NewMeterProvider associates reader via WithReader option","metric.NewMeterProvider creates a functioning Meter that can record metrics","MeterProvider ForceFlush succeeds on active provider","MeterProvider Shutdown cleanly terminates provider resources"],"goal":"verify pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0"],"schemaVersion":1},"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/sdk/metric@v1.42.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0","verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/go-logr/logr v1.4.3 // indirect
	github.com/go-logr/stdr v1.2.2 // indirect
	github.com/google/uuid v1.6.0 // indirect
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel v1.42.0 // indirect
	go.opentelemetry.io/otel/metric v1.42.0 // indirect
	go.opentelemetry.io/otel/sdk v1.42.0 // indirect
	go.opentelemetry.io/otel/sdk/metric v1.42.0 // indirect
	go.opentelemetry.io/otel/trace v1.42.0 // indirect
	golang.org/x/sys v0.41.0 // indirect
)

github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
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/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
go.opentelemetry.io/otel v1.42.0 h1:lSQGzTgVR3+sgJDAU/7/ZMjN9Z+vUip7leaqBKy4sho=
go.opentelemetry.io/otel v1.42.0/go.mod h1:lJNsdRMxCUIWuMlVJWzecSMuNjE7dOYyWlqOXWkdqCc=
go.opentelemetry.io/otel/metric v1.42.0 h1:2jXG+3oZLNXEPfNmnpxKDeZsFI5o4J+nz6xUlaFdF/4=
go.opentelemetry.io/otel/metric v1.42.0/go.mod h1:RlUN/7vTU7Ao/diDkEpQpnz3/92J9ko05BIwxYa2SSI=
go.opentelemetry.io/otel/sdk v1.42.0 h1:LyC8+jqk6UJwdrI/8VydAq/hvkFKNHZVIWuslJXYsDo=
go.opentelemetry.io/otel/sdk v1.42.0/go.mod h1:rGHCAxd9DAph0joO4W6OPwxjNTYWghRWmkHuGbayMts=
go.opentelemetry.io/otel/sdk/metric v1.42.0 h1:D/1QR46Clz6ajyZ3G8SgNlTJKBdGp84q9RKCAZ3YGuA=
go.opentelemetry.io/otel/sdk/metric v1.42.0/go.mod h1:Ua6AAlDKdZ7tdvaQKfSmnFTdHx37+J4ba8MwVCYM5hc=
go.opentelemetry.io/otel/trace v1.42.0 h1:OUCgIPt+mzOnaUTpOQcBiM/PLQ/Op7oq6g4LenLmOYY=
go.opentelemetry.io/otel/trace v1.42.0/go.mod h1:f3K9S+IFqnumBkKhRJMeaZeNk9epyhnCmQh/EysQCdc=
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

package sample

import (
	"context"

	"go.opentelemetry.io/otel/sdk/metric"
	"go.opentelemetry.io/otel/sdk/resource"
)

// NewDefaultMeterProvider creates a new *metric.MeterProvider with default configuration.
func NewDefaultMeterProvider() *metric.MeterProvider {
	return metric.NewMeterProvider()
}

// NewMeterProviderWithReader creates a *metric.MeterProvider configured with a metric.Reader.
func NewMeterProviderWithReader(r metric.Reader) *metric.MeterProvider {
	return metric.NewMeterProvider(
		metric.WithReader(r),
	)
}

// NewMeterProviderWithResourceAndReader creates a *metric.MeterProvider with custom resource and reader.
func NewMeterProviderWithResourceAndReader(res *resource.Resource, r metric.Reader) *metric.MeterProvider {
	return metric.NewMeterProvider(
		metric.WithResource(res),
		metric.WithReader(r),
	)
}

// ShutdownProvider shuts down the provider with the given context.
func ShutdownProvider(ctx context.Context, mp *metric.MeterProvider) error {
	if mp == nil {
		return nil
	}
	return mp.Shutdown(ctx)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/sdk/metric"
	"go.opentelemetry.io/otel/sdk/metric/metricdata"
	"go.opentelemetry.io/otel/sdk/resource"
	"sample"
)

func main() {
	ctx := context.Background()

	// Assertion 1: metric.NewMeterProvider creates a non-nil *MeterProvider instance with default settings
	defaultProvider := sample.NewDefaultMeterProvider()
	if defaultProvider == nil {
		fmt.Fprintf(os.Stderr, "FAIL: default NewMeterProvider returned nil\n")
		os.Exit(1)
	}
	if err := defaultProvider.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: defaultProvider Shutdown failed: %v\n", err)
		os.Exit(1)
	}

	// Assertion 2: metric.NewMeterProvider associates reader via WithReader option
	reader := metric.NewManualReader()
	res := resource.NewSchemaless(
		attribute.String("service.name", "contract-test-service"),
		attribute.String("service.version", "1.0.0"),
	)
	mp := sample.NewMeterProviderWithResourceAndReader(res, reader)
	if mp == nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewMeterProviderWithResourceAndReader returned nil\n")
		os.Exit(1)
	}

	// Assertion 3: metric.NewMeterProvider creates a functioning Meter that can record metrics
	m := mp.Meter("sample-meter")
	if m == nil {
		fmt.Fprintf(os.Stderr, "FAIL: Meter returned nil\n")
		os.Exit(1)
	}
	counter, err := m.Int64Counter("sample_counter")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: failed to create counter: %v\n", err)
		os.Exit(1)
	}
	counter.Add(ctx, 10)

	var rm metricdata.ResourceMetrics
	if err := reader.Collect(ctx, &rm); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: reader Collect failed: %v\n", err)
		os.Exit(1)
	}
	if len(rm.ScopeMetrics) == 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected ScopeMetrics to contain recorded metrics\n")
		os.Exit(1)
	}

	// Assertion 4: MeterProvider ForceFlush succeeds on active provider
	if err := mp.ForceFlush(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: ForceFlush failed: %v\n", err)
		os.Exit(1)
	}

	// Assertion 5: MeterProvider Shutdown cleanly terminates provider resources
	if err := mp.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: Shutdown failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.42.0 contract verified")
}