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

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.NewMeterConfig 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.NewMeterConfig

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:sha256:1b5d5858de171a9d2ab0aff1c44e0888d758ae255ed0a79b3dd479e8d86988da","contract":["NewMeterConfig creates a MeterConfig with zero-value defaults when called without options","NewMeterConfig applies WithInstrumentationVersion, WithSchemaURL, and WithInstrumentationAttributes","NewMeterConfig combines multiple options and resolves sequential configuration overrides"],"goal":"verify go.opentelemetry.io/otel/metric.NewMeterConfig 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.NewMeterConfig"]},"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.NewMeterConfig"],"verifierAdapter":"golang@1"}

module example.com/meterconfig

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 meterconfig

import (
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/metric"
)

// BuildMeterConfig creates a new metric.MeterConfig applying the provided options.
func BuildMeterConfig(opts ...metric.MeterOption) metric.MeterConfig {
	return metric.NewMeterConfig(opts...)
}

// ConfiguredOptions returns a slice of metric.MeterOption configuring instrumentation
// version, schema URL, and attributes.
func ConfiguredOptions(version, schemaURL string, attrs ...attribute.KeyValue) []metric.MeterOption {
	opts := make([]metric.MeterOption, 0, 3)
	if version != "" {
		opts = append(opts, metric.WithInstrumentationVersion(version))
	}
	if schemaURL != "" {
		opts = append(opts, metric.WithSchemaURL(schemaURL))
	}
	if len(attrs) > 0 {
		opts = append(opts, metric.WithInstrumentationAttributes(attrs...))
	}
	return opts
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/metric.NewMeterConfig 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.NewMeterConfig"
  ]
}

package main

import (
	"fmt"
	"os"

	meterconfig "example.com/meterconfig"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/metric"
)

func main() {
	// Assertion 1: NewMeterConfig without options creates MeterConfig with zero-value defaults
	cfgDefault := metric.NewMeterConfig()
	if got := cfgDefault.InstrumentationVersion(); got != "" {
		fmt.Fprintf(os.Stderr, "FAIL: default InstrumentationVersion mismatch: got %q, want \"\"\n", got)
		os.Exit(1)
	}
	if got := cfgDefault.SchemaURL(); got != "" {
		fmt.Fprintf(os.Stderr, "FAIL: default SchemaURL mismatch: got %q, want \"\"\n", got)
		os.Exit(1)
	}
	defaultAttrs := cfgDefault.InstrumentationAttributes()
	if got := defaultAttrs.Len(); got != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: default InstrumentationAttributes length mismatch: got %d, want 0\n", got)
		os.Exit(1)
	}

	// Assertion 2: NewMeterConfig applies WithInstrumentationVersion, WithSchemaURL, and WithInstrumentationAttributes
	const testVersion = "1.37.0"
	cfgVersion := metric.NewMeterConfig(metric.WithInstrumentationVersion(testVersion))
	if got := cfgVersion.InstrumentationVersion(); got != testVersion {
		fmt.Fprintf(os.Stderr, "FAIL: InstrumentationVersion mismatch: got %q, want %q\n", got, testVersion)
		os.Exit(1)
	}

	const testSchemaURL = "https://example.com/schemas/v1.0"
	cfgSchema := metric.NewMeterConfig(metric.WithSchemaURL(testSchemaURL))
	if got := cfgSchema.SchemaURL(); got != testSchemaURL {
		fmt.Fprintf(os.Stderr, "FAIL: SchemaURL mismatch: got %q, want %q\n", got, testSchemaURL)
		os.Exit(1)
	}

	attrKeyStr := attribute.Key("component")
	attrKeyInt := attribute.Key("priority")
	attr1 := attrKeyStr.String("storage")
	attr2 := attrKeyInt.Int(3)
	cfgAttr := metric.NewMeterConfig(metric.WithInstrumentationAttributes(attr1, attr2))
	attrSet := cfgAttr.InstrumentationAttributes()
	if attrSet.Len() != 2 {
		fmt.Fprintf(os.Stderr, "FAIL: InstrumentationAttributes length mismatch: got %d, want 2\n", attrSet.Len())
		os.Exit(1)
	}
	valStr, okStr := attrSet.Value(attrKeyStr)
	if !okStr || valStr.AsString() != "storage" {
		fmt.Fprintf(os.Stderr, "FAIL: attribute %q mismatch: ok=%v, val=%v\n", attrKeyStr, okStr, valStr.AsString())
		os.Exit(1)
	}
	valInt, okInt := attrSet.Value(attrKeyInt)
	if !okInt || valInt.AsInt64() != 3 {
		fmt.Fprintf(os.Stderr, "FAIL: attribute %q mismatch: ok=%v, val=%v\n", attrKeyInt, okInt, valInt.AsInt64())
		os.Exit(1)
	}

	// Assertion 3: NewMeterConfig combines multiple options and resolves sequential overrides
	cfgCombined := meterconfig.BuildMeterConfig(
		metric.WithInstrumentationVersion("1.0.0"),
		metric.WithSchemaURL("https://example.com/schemas/v1.0"),
		metric.WithInstrumentationAttributes(attribute.String("env", "production")),
		metric.WithInstrumentationVersion("2.0.0"),
	)
	if got := cfgCombined.InstrumentationVersion(); got != "2.0.0" {
		fmt.Fprintf(os.Stderr, "FAIL: combined InstrumentationVersion override mismatch: got %q, want \"2.0.0\"\n", got)
		os.Exit(1)
	}
	if got := cfgCombined.SchemaURL(); got != "https://example.com/schemas/v1.0" {
		fmt.Fprintf(os.Stderr, "FAIL: combined SchemaURL mismatch: got %q, want \"https://example.com/schemas/v1.0\"\n", got)
		os.Exit(1)
	}
	attrsCombined := cfgCombined.InstrumentationAttributes()
	if envVal, ok := attrsCombined.Value(attribute.Key("env")); !ok || envVal.AsString() != "production" {
		fmt.Fprintf(os.Stderr, "FAIL: combined attribute 'env' mismatch: ok=%v, val=%v\n", ok, envVal.AsString())
		os.Exit(1)
	}

	helperOpts := meterconfig.ConfiguredOptions("3.0.0", "https://example.com/schemas/v2.0", attribute.Bool("enabled", true))
	cfgHelper := meterconfig.BuildMeterConfig(helperOpts...)
	if got := cfgHelper.InstrumentationVersion(); got != "3.0.0" {
		fmt.Fprintf(os.Stderr, "FAIL: helper InstrumentationVersion mismatch: got %q, want \"3.0.0\"\n", got)
		os.Exit(1)
	}
	if got := cfgHelper.SchemaURL(); got != "https://example.com/schemas/v2.0" {
		fmt.Fprintf(os.Stderr, "FAIL: helper SchemaURL mismatch: got %q, want \"https://example.com/schemas/v2.0\"\n", got)
		os.Exit(1)
	}
	attrsHelper := cfgHelper.InstrumentationAttributes()
	if boolVal, ok := attrsHelper.Value(attribute.Key("enabled")); !ok || !boolVal.AsBool() {
		fmt.Fprintf(os.Stderr, "FAIL: helper attribute 'enabled' mismatch: ok=%v, val=%v\n", ok, boolVal.AsBool())
		os.Exit(1)
	}

	fmt.Println("PASS: NewMeterConfig contract passed")
}