go.opentelemetry.io/otel/log v0.19.0: Record

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/log.Record in pkg:golang/go.opentelemetry.io/otel/log@v0.19.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/log@v0.19.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/log.Record

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.

package sample

import (
	"testing"
	"time"

	"go.opentelemetry.io/otel/log"
)

func TestContractRecord(t *testing.T) {
	now := time.Date(2026, 9, 1, 10, 0, 0, 0, time.UTC)
	entry := LogEntry{
		Timestamp:   now,
		Severity:    log.SeverityInfo,
		SeverityTxt: "INFO",
		EventName:   "http.request",
		Message:     "request processed",
		Attributes: []log.KeyValue{
			log.String("http.method", "GET"),
			log.Int("http.status_code", 200),
			log.Bool("http.secure", true),
			log.Float64("latency_ms", 15.4),
			log.Slice("tags", log.StringValue("web"), log.StringValue("api")),
			log.Map("user", log.String("id", "usr-12345"), log.String("role", "admin")),
		},
	}

	record := BuildRecord(entry)

	if !record.Timestamp().Equal(now) {
		t.Fatalf("expected timestamp %v, got %v", now, record.Timestamp())
	}
	if !record.ObservedTimestamp().Equal(now) {
		t.Fatalf("expected observed timestamp %v, got %v", now, record.ObservedTimestamp())
	}
	if record.Severity() != log.SeverityInfo {
		t.Fatalf("expected severity %v, got %v", log.SeverityInfo, record.Severity())
	}
	if record.SeverityText() != "INFO" {
		t.Fatalf("expected severity text INFO, got %s", record.SeverityText())
	}
	if record.EventName() != "http.request" {
		t.Fatalf("expected event name http.request, got %s", record.EventName())
	}
	if record.Body().AsString() != "request processed" {
		t.Fatalf("expected body 'request processed', got %s", record.Body().AsString())
	}
	if record.AttributesLen() != 6 {
		t.Fatalf("expected 6 attributes, got %d", record.AttributesLen())
	}

	attrs := ExtractAttributes(&record)
	if attrs["http.method"].AsString() != "GET" {
		t.Fatalf("expected method GET, got %s", attrs["http.method"].AsString())
	}
	if attrs["http.status_code"].AsInt64() != 200 {
		t.Fatalf("expected status 200, got %d", attrs["http.status_code"].AsInt64())
	}
	if !attrs["http.secure"].AsBool() {
		t.Fatalf("expected secure true, got %v", attrs["http.secure"].AsBool())
	}
	if attrs["latency_ms"].AsFloat64() != 15.4 {
		t.Fatalf("expected latency 15.4, got %f", attrs["latency_ms"].AsFloat64())
	}
	if len(attrs["tags"].AsSlice()) != 2 {
		t.Fatalf("expected 2 tags, got %d", len(attrs["tags"].AsSlice()))
	}
	if len(attrs["user"].AsMap()) != 2 {
		t.Fatalf("expected 2 user map items, got %d", len(attrs["user"].AsMap()))
	}

	cloned := record.Clone()
	cloned.SetSeverity(log.SeverityError)
	cloned.SetSeverityText("ERROR")
	cloned.AddAttributes(log.String("extra", "test"))

	if record.Severity() != log.SeverityInfo {
		t.Fatalf("original severity modified: got %v, want %v", record.Severity(), log.SeverityInfo)
	}
	if record.AttributesLen() != 6 {
		t.Fatalf("original attributes len modified: got %d, want 6", record.AttributesLen())
	}
	if cloned.Severity() != log.SeverityError {
		t.Fatalf("cloned severity mismatch: got %v, want %v", cloned.Severity(), log.SeverityError)
	}
	if cloned.AttributesLen() != 7 {
		t.Fatalf("cloned attributes len mismatch: got %d, want 7", cloned.AttributesLen())
	}
}

{"case":{"caseId":"case:sha256:3a182f64cef82a74d29b188935919b606febe74b7fd437e0f739d1448fed05a3","contract":["Record constructs with timestamp, observed timestamp, severity, severity text, event name, and body","Record adds and extracts typed KeyValue attributes for string, int, bool, float, slice, and map","Record supports attribute inspection via WalkAttributes and AttributesLen","Record Clone creates an independent copy preserving attributes and severity"],"goal":"verify go.opentelemetry.io/otel/log.Record in pkg:golang/go.opentelemetry.io/otel/log@v0.19.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/log@v0.19.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/log.Record"]},"contractCommand":["go","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/log@v0.19.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/log@v0.19.0","symbols":["go.opentelemetry.io/otel/log.Record"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require go.opentelemetry.io/otel/log v0.19.0

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
	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
	go.opentelemetry.io/otel v1.43.0 // indirect
	go.opentelemetry.io/otel/metric v1.43.0 // indirect
	go.opentelemetry.io/otel/trace v1.43.0 // 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/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/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 v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
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 v1.43.0 h1:mYIM03dnh5zfN7HautFE4ieIig9amkNANT+xcVxAj9I=
go.opentelemetry.io/otel v1.43.0/go.mod h1:JuG+u74mvjvcm8vj8pI5XiHy1zDeoCS2LB1spIq7Ay0=
go.opentelemetry.io/otel/log v0.19.0 h1:KUZs/GOsw79TBBMfDWsXS+KZ4g2Ckzksd1ymzsIEbo4=
go.opentelemetry.io/otel/log v0.19.0/go.mod h1:5DQYeGmxVIr4n0/BcJvF4upsraHjg6vudJJpnkL6Ipk=
go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
go.opentelemetry.io/otel/metric v1.43.0/go.mod h1:RDnPtIxvqlgO8GRW18W6Z/4P462ldprJtfxHxyKd2PY=
go.opentelemetry.io/otel/trace v1.43.0 h1:BkNrHpup+4k4w+ZZ86CZoHHEkohws8AY+WTX09nk+3A=
go.opentelemetry.io/otel/trace v1.43.0/go.mod h1:/QJhyVBUUswCphDVxq+8mld+AvhXZLhe+8WVFxiFff0=
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 (
	"time"

	"go.opentelemetry.io/otel/log"
)

// LogEntry represents an application log item to be converted into an OpenTelemetry log.Record.
type LogEntry struct {
	Timestamp   time.Time
	Severity    log.Severity
	SeverityTxt string
	EventName   string
	Message     string
	Attributes  []log.KeyValue
}

// BuildRecord builds an OpenTelemetry log.Record from a LogEntry.
func BuildRecord(entry LogEntry) log.Record {
	var r log.Record
	if !entry.Timestamp.IsZero() {
		r.SetTimestamp(entry.Timestamp)
		r.SetObservedTimestamp(entry.Timestamp)
	}
	r.SetSeverity(entry.Severity)
	r.SetSeverityText(entry.SeverityTxt)
	r.SetEventName(entry.EventName)
	r.SetBody(log.StringValue(entry.Message))
	if len(entry.Attributes) > 0 {
		r.AddAttributes(entry.Attributes...)
	}
	return r
}

// ExtractAttributes collects attributes from a log.Record into a map.
func ExtractAttributes(r *log.Record) map[string]log.Value {
	attrs := make(map[string]log.Value, r.AttributesLen())
	r.WalkAttributes(func(kv log.KeyValue) bool {
		attrs[kv.Key] = kv.Value
		return true
	})
	return attrs
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/log.Record in pkg:golang/go.opentelemetry.io/otel/log@v0.19.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/log@v0.19.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/log.Record"
  ]
}