go.opentelemetry.io/otel/sdk/metric v1.37.0: metricdata.DeltaTemporality

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/metricdata.DeltaTemporality 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/metricdata.DeltaTemporality

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:sha256:0b7f8ac1f4c84fca8af6af34949d1bb55cef15acad1689fe42c97a3d47c411b5","contract":["metricdata.DeltaTemporality is defined as Temporality representing delta aggregation intervals","metricdata.DeltaTemporality string representation and text marshaling return DeltaTemporality","DeltaTemporality differs from CumulativeTemporality","TemporalitySelector configured for DeltaTemporality returns DeltaTemporality","ManualReader configured with DeltaTemporality produces metric aggregations with DeltaTemporality"],"goal":"verify go.opentelemetry.io/otel/sdk/metric/metricdata.DeltaTemporality 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/metricdata.DeltaTemporality"]},"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/metricdata.DeltaTemporality"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require 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 v1.37.0 // indirect
	go.opentelemetry.io/otel/metric v1.37.0 // 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 main

import (
	"context"
	"fmt"

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

func deltaTemporalitySelector(metric.InstrumentKind) metricdata.Temporality {
	return metricdata.DeltaTemporality
}

func main() {
	fmt.Printf("DeltaTemporality: %s\n", metricdata.DeltaTemporality)

	selector := metric.TemporalitySelector(deltaTemporalitySelector)
	temporality := selector(metric.InstrumentKindCounter)
	fmt.Printf("Counter temporality: %s\n", temporality)

	reader := metric.NewManualReader(metric.WithTemporalitySelector(deltaTemporalitySelector))
	mp := metric.NewMeterProvider(metric.WithReader(reader))
	defer func() { _ = mp.Shutdown(context.Background()) }()

	meter := mp.Meter("sample-meter")
	counter, err := meter.Int64Counter("items_processed")
	if err != nil {
		panic(err)
	}

	ctx := context.Background()
	counter.Add(ctx, 42)

	var rm metricdata.ResourceMetrics
	if err := reader.Collect(ctx, &rm); err != nil {
		panic(err)
	}

	for _, sm := range rm.ScopeMetrics {
		for _, m := range sm.Metrics {
			if sumData, ok := m.Data.(metricdata.Sum[int64]); ok {
				fmt.Printf("Metric %s has temporality: %s\n", m.Name, sumData.Temporality)
			}
		}
	}
}

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

package main

import (
	"context"
	"fmt"
	"os"

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

func main() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func runTests() error {
	// 1. metricdata.DeltaTemporality is defined as Temporality representing delta aggregation intervals
	var t metricdata.Temporality = metricdata.DeltaTemporality
	if t != metricdata.DeltaTemporality {
		return fmt.Errorf("expected Temporality to match DeltaTemporality")
	}

	// 2. metricdata.DeltaTemporality string representation and text marshaling return DeltaTemporality
	if str := metricdata.DeltaTemporality.String(); str != "DeltaTemporality" {
		return fmt.Errorf("expected String() 'DeltaTemporality', got %q", str)
	}
	text, err := metricdata.DeltaTemporality.MarshalText()
	if err != nil {
		return fmt.Errorf("unexpected error marshaling DeltaTemporality: %w", err)
	}
	if string(text) != "DeltaTemporality" {
		return fmt.Errorf("expected MarshalText() 'DeltaTemporality', got %q", string(text))
	}

	// 3. DeltaTemporality differs from CumulativeTemporality
	if metricdata.DeltaTemporality == metricdata.CumulativeTemporality {
		return fmt.Errorf("expected DeltaTemporality != CumulativeTemporality")
	}

	// 4. TemporalitySelector configured for DeltaTemporality returns DeltaTemporality
	deltaSelector := func(metric.InstrumentKind) metricdata.Temporality {
		return metricdata.DeltaTemporality
	}
	var selector metric.TemporalitySelector = deltaSelector
	if got := selector(metric.InstrumentKindCounter); got != metricdata.DeltaTemporality {
		return fmt.Errorf("expected DeltaTemporality for Counter, got %v", got)
	}
	if got := selector(metric.InstrumentKindHistogram); got != metricdata.DeltaTemporality {
		return fmt.Errorf("expected DeltaTemporality for Histogram, got %v", got)
	}

	// 5. ManualReader configured with DeltaTemporality produces metric aggregations with DeltaTemporality
	reader := metric.NewManualReader(metric.WithTemporalitySelector(deltaSelector))
	mp := metric.NewMeterProvider(metric.WithReader(reader))
	defer func() { _ = mp.Shutdown(context.Background()) }()

	meter := mp.Meter("example.com/test-meter")
	counter, err := meter.Int64Counter("test_counter")
	if err != nil {
		return fmt.Errorf("failed to create counter: %w", err)
	}

	ctx := context.Background()
	counter.Add(ctx, 15)

	var rm metricdata.ResourceMetrics
	if err := reader.Collect(ctx, &rm); err != nil {
		return fmt.Errorf("failed to collect metrics: %w", err)
	}

	if len(rm.ScopeMetrics) == 0 || len(rm.ScopeMetrics[0].Metrics) == 0 {
		return fmt.Errorf("expected at least one metric recorded")
	}

	sumData, ok := rm.ScopeMetrics[0].Metrics[0].Data.(metricdata.Sum[int64])
	if !ok {
		return fmt.Errorf("expected metric data to be Sum[int64], got %T", rm.ScopeMetrics[0].Metrics[0].Data)
	}

	if sumData.Temporality != metricdata.DeltaTemporality {
		return fmt.Errorf("expected sum temporality to be DeltaTemporality, got %v", sumData.Temporality)
	}

	if len(sumData.DataPoints) != 1 || sumData.DataPoints[0].Value != 15 {
		return fmt.Errorf("expected data point value 15, got %v", sumData.DataPoints)
	}

	return nil
}