go.opentelemetry.io/otel/metric v1.37.0: MeterConfig

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 go.opentelemetry.io/otel/metric.MeterConfig in pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/metric.MeterConfig

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:e9302bbb8d80f540db157e2bd9112db09e83d35df74dfdbc7353831004a72f4b","contract":["NewMeterConfig with no options produces empty version schema URL and attributes","NewMeterConfig with WithInstrumentationVersion sets instrumentation version","NewMeterConfig with WithSchemaURL sets schema URL","NewMeterConfig with WithInstrumentationAttributes sets instrumentation attribute set","NewMeterConfig combines multiple MeterOption options into MeterConfig","MeterProvider accepts MeterOptions configured through MeterConfig options"],"goal":"verify go.opentelemetry.io/otel/metric.MeterConfig in pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/metric.MeterConfig"]},"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@v1.37.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0","symbols":["go.opentelemetry.io/otel/metric.MeterConfig"],"verifierAdapter":"golang@1"}

module example.com/meterconfig-sample

go 1.23.0

require (
	go.opentelemetry.io/otel v1.37.0
	go.opentelemetry.io/otel/metric v1.37.0
)

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 v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
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 v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

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

func main() {
	cfg := metric.NewMeterConfig(
		metric.WithInstrumentationVersion("1.37.0"),
		metric.WithSchemaURL("https://example.com/schemas/1.37.0"),
		metric.WithInstrumentationAttributes(
			attribute.String("service.name", "demo-service"),
		),
	)

	fmt.Printf("InstrumentationVersion: %s\n", cfg.InstrumentationVersion())
	fmt.Printf("SchemaURL: %s\n", cfg.SchemaURL())
	attrs := cfg.InstrumentationAttributes()
	fmt.Printf("Attributes count: %d\n", attrs.Len())

	mp := noop.NewMeterProvider()
	meter := mp.Meter(
		"example.com/demo-meter",
		metric.WithInstrumentationVersion(cfg.InstrumentationVersion()),
		metric.WithSchemaURL(cfg.SchemaURL()),
	)
	if meter == nil {
		panic("expected non-nil Meter")
	}

	fmt.Println("MeterConfig sample executed successfully.")
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/metric.MeterConfig in pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/metric@v1.37.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/metric.MeterConfig"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// 1. NewMeterConfig with no options produces empty version schema URL and attributes
	defaultCfg := metric.NewMeterConfig()
	if defaultCfg.InstrumentationVersion() != "" {
		fmt.Fprintf(os.Stderr, "expected empty instrumentation version, got %q\n", defaultCfg.InstrumentationVersion())
		os.Exit(1)
	}
	if defaultCfg.SchemaURL() != "" {
		fmt.Fprintf(os.Stderr, "expected empty schema URL, got %q\n", defaultCfg.SchemaURL())
		os.Exit(1)
	}
	defaultAttrs := defaultCfg.InstrumentationAttributes()
	if defaultAttrs.Len() != 0 {
		fmt.Fprintf(os.Stderr, "expected empty attributes, got %d\n", defaultAttrs.Len())
		os.Exit(1)
	}

	// 2. NewMeterConfig with WithInstrumentationVersion sets instrumentation version
	const expectedVersion = "1.37.0"
	versionCfg := metric.NewMeterConfig(metric.WithInstrumentationVersion(expectedVersion))
	if versionCfg.InstrumentationVersion() != expectedVersion {
		fmt.Fprintf(os.Stderr, "expected version %q, got %q\n", expectedVersion, versionCfg.InstrumentationVersion())
		os.Exit(1)
	}

	// 3. NewMeterConfig with WithSchemaURL sets schema URL
	const expectedSchemaURL = "https://example.com/schemas/1.37.0"
	schemaCfg := metric.NewMeterConfig(metric.WithSchemaURL(expectedSchemaURL))
	if schemaCfg.SchemaURL() != expectedSchemaURL {
		fmt.Fprintf(os.Stderr, "expected schema URL %q, got %q\n", expectedSchemaURL, schemaCfg.SchemaURL())
		os.Exit(1)
	}

	// 4. NewMeterConfig with WithInstrumentationAttributes sets instrumentation attribute set
	attrKey := attribute.Key("service.component")
	attrVal := "auth-service"
	attrCfg := metric.NewMeterConfig(metric.WithInstrumentationAttributes(attrKey.String(attrVal)))
	attrSet := attrCfg.InstrumentationAttributes()
	val, ok := attrSet.Value(attrKey)
	if !ok || val.AsString() != attrVal {
		fmt.Fprintf(os.Stderr, "expected attribute %s=%q, got ok=%v val=%v\n", attrKey, attrVal, ok, val)
		os.Exit(1)
	}

	// 5. NewMeterConfig combines multiple MeterOption options into MeterConfig
	multiCfg := metric.NewMeterConfig(
		metric.WithInstrumentationVersion("2.1.0"),
		metric.WithSchemaURL("https://example.com/schemas/1.21.0"),
		metric.WithInstrumentationAttributes(
			attribute.String("env", "staging"),
			attribute.Int("tier", 2),
		),
	)
	if multiCfg.InstrumentationVersion() != "2.1.0" {
		fmt.Fprintf(os.Stderr, "expected multiCfg version %q, got %q\n", "2.1.0", multiCfg.InstrumentationVersion())
		os.Exit(1)
	}
	if multiCfg.SchemaURL() != "https://example.com/schemas/1.21.0" {
		fmt.Fprintf(os.Stderr, "expected multiCfg schema URL %q, got %q\n", "https://example.com/schemas/1.21.0", multiCfg.SchemaURL())
		os.Exit(1)
	}
	multiAttrs := multiCfg.InstrumentationAttributes()
	if multiAttrs.Len() != 2 {
		fmt.Fprintf(os.Stderr, "expected 2 attributes, got %d\n", multiAttrs.Len())
		os.Exit(1)
	}

	// 6. MeterProvider accepts MeterOptions configured through MeterConfig options
	mp := noop.NewMeterProvider()
	meter := mp.Meter(
		"example.com/contract-meter",
		metric.WithInstrumentationVersion("1.37.0"),
		metric.WithSchemaURL("https://example.com/schemas/1.37.0"),
	)
	if meter == nil {
		fmt.Fprintf(os.Stderr, "expected non-nil Meter from MeterProvider\n")
		os.Exit(1)
	}

	fmt.Println("All MeterConfig contract assertions passed successfully.")
}