go.opentelemetry.io/otel/sdk/metric v1.37.0: InstrumentKind

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

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

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:fdd7ace99f769c6e81a313c4d54a42de50c34d083e28128105c491b95d8f4071","contract":["SupportedKinds returns all standard InstrumentKind constants with valid String names","DefaultTemporalitySelector returns cumulative temporality for standard InstrumentKind values","DefaultAggregationSelector selects non-nil aggregation for standard InstrumentKind values","NewCustomReader configures a ManualReader with custom TemporalitySelector using InstrumentKind"],"goal":"verify go.opentelemetry.io/otel/sdk/metric.InstrumentKind in pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.37.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.37.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/sdk/metric.InstrumentKind"]},"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@v1.37.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/sdk/metric@v1.37.0","symbols":["go.opentelemetry.io/otel/sdk/metric.InstrumentKind"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

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

require (
	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 v1.1.0 // indirect
	go.opentelemetry.io/otel/sdk v1.37.0 // indirect
	go.opentelemetry.io/otel/trace v1.37.0 // indirect
	golang.org/x/sys v0.33.0 // indirect
)

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 v1.2.2/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/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
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=
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/sdk v1.37.0 h1:ItB0QUqnjesGRvNcmAcU0LyvkVyGJ2xftD29bWdDvKI=
go.opentelemetry.io/otel/sdk v1.37.0/go.mod h1:VredYzxUvuo2q3WRcDnKDjbdvmO0sCzOvVAiY+yUkAg=
go.opentelemetry.io/otel/sdk/metric v1.37.0 h1:90lI228XrB9jCMuSdA0673aubgRobVZFhbjxHHspCPc=
go.opentelemetry.io/otel/sdk/metric v1.37.0/go.mod h1:cNen4ZWfiD37l5NhS+Keb5RXVWZWpRE+9WyVCpbo5ps=
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=
golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package sample

import (
	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
	"go.opentelemetry.io/otel/sdk/metric/metricdata"
)

// SupportedKinds returns all standard InstrumentKind constants.
func SupportedKinds() []sdkmetric.InstrumentKind {
	return []sdkmetric.InstrumentKind{
		sdkmetric.InstrumentKindCounter,
		sdkmetric.InstrumentKindUpDownCounter,
		sdkmetric.InstrumentKindHistogram,
		sdkmetric.InstrumentKindObservableCounter,
		sdkmetric.InstrumentKindObservableUpDownCounter,
		sdkmetric.InstrumentKindObservableGauge,
		sdkmetric.InstrumentKindGauge,
	}
}

// DescribeKind returns the string name of the given InstrumentKind.
func DescribeKind(kind sdkmetric.InstrumentKind) string {
	return kind.String()
}

// SelectTemporality returns the temporality chosen by DefaultTemporalitySelector for the InstrumentKind.
func SelectTemporality(kind sdkmetric.InstrumentKind) metricdata.Temporality {
	return sdkmetric.DefaultTemporalitySelector(kind)
}

// SelectAggregation returns the aggregation chosen by DefaultAggregationSelector for the InstrumentKind.
func SelectAggregation(kind sdkmetric.InstrumentKind) sdkmetric.Aggregation {
	return sdkmetric.DefaultAggregationSelector(kind)
}

// NewCustomReader creates a ManualReader configured with a custom TemporalitySelector based on InstrumentKind.
func NewCustomReader(selector sdkmetric.TemporalitySelector) *sdkmetric.ManualReader {
	return sdkmetric.NewManualReader(sdkmetric.WithTemporalitySelector(selector))
}

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

package main

import (
	"context"
	"fmt"
	"os"

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

func main() {
	// Assertion 1: SupportedKinds returns all standard InstrumentKind constants with valid String names
	kinds := sample.SupportedKinds()
	if len(kinds) != 7 {
		fmt.Fprintf(os.Stderr, "FAIL: expected 7 standard InstrumentKind values, got %d\n", len(kinds))
		os.Exit(1)
	}
	expectedNames := map[sdkmetric.InstrumentKind]string{
		sdkmetric.InstrumentKindCounter:               "Counter",
		sdkmetric.InstrumentKindUpDownCounter:         "UpDownCounter",
		sdkmetric.InstrumentKindHistogram:             "Histogram",
		sdkmetric.InstrumentKindObservableCounter:     "ObservableCounter",
		sdkmetric.InstrumentKindObservableUpDownCounter: "ObservableUpDownCounter",
		sdkmetric.InstrumentKindObservableGauge:       "ObservableGauge",
		sdkmetric.InstrumentKindGauge:                 "Gauge",
	}
	for _, kind := range kinds {
		expected, exists := expectedNames[kind]
		if !exists {
			fmt.Fprintf(os.Stderr, "FAIL: unexpected InstrumentKind: %v\n", kind)
			os.Exit(1)
		}
		if got := sample.DescribeKind(kind); got != expected {
			fmt.Fprintf(os.Stderr, "FAIL: expected kind string %q, got %q\n", expected, got)
			os.Exit(1)
		}
	}

	// Assertion 2: DefaultTemporalitySelector returns cumulative temporality for standard InstrumentKind values
	for _, kind := range kinds {
		temp := sample.SelectTemporality(kind)
		if temp != metricdata.CumulativeTemporality {
			fmt.Fprintf(os.Stderr, "FAIL: expected CumulativeTemporality for %v, got %v\n", kind, temp)
			os.Exit(1)
		}
	}

	// Assertion 3: DefaultAggregationSelector selects non-nil aggregation for standard InstrumentKind values
	for _, kind := range kinds {
		agg := sample.SelectAggregation(kind)
		if agg == nil {
			fmt.Fprintf(os.Stderr, "FAIL: expected non-nil Aggregation for %v\n", kind)
			os.Exit(1)
		}
	}

	// Assertion 4: NewCustomReader configures a ManualReader with custom TemporalitySelector using InstrumentKind
	deltaSelector := func(kind sdkmetric.InstrumentKind) metricdata.Temporality {
		if kind == sdkmetric.InstrumentKindCounter {
			return metricdata.DeltaTemporality
		}
		return metricdata.CumulativeTemporality
	}
	reader := sample.NewCustomReader(deltaSelector)
	if reader == nil {
		fmt.Fprintf(os.Stderr, "FAIL: NewCustomReader returned nil\n")
		os.Exit(1)
	}

	ctx := context.Background()
	if err := reader.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: reader Shutdown failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: go.opentelemetry.io/otel/sdk/metric.InstrumentKind contract verified")
}