opentelemetry-go/README.md

OpenTelemetry-Go

The Go OpenTelemetry client.

Installation

This repository includes multiple packages. The api package contains core data types, interfaces and no-op implementations that comprise the OpenTelemetry API following the specification. The sdk package is the reference implementation of the API.

Libraries that produce telemetry data should only depend on api and defer the choice of the SDK to the application developer. Applications may depend on sdk or another package that implements the API.

All packages are published to go.opentelemetry.io/otel and is the preferred location to import from.

Additional resources:

• Developing using Go Modules
• Adding dependencies and installing them

Quick Start

Below is a brief example of importing OpenTelemetry, initializing a tracer and creating some simple spans.

package main

import (
	"context"
	"log"

	"go.opentelemetry.io/otel/api/global"
	"go.opentelemetry.io/otel/exporters/trace/stdout"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
)

func initTracer() {
	exporter, err := stdout.NewExporter(stdout.Options{PrettyPrint: true})
	if err != nil {
		log.Fatal(err)
	}
	tp, err := sdktrace.NewProvider(sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
		sdktrace.WithSyncer(exporter))
	if err != nil {
		log.Fatal(err)
	}
	global.SetTraceProvider(tp)
}

func main() {
	initTracer()
	tracer := global.Tracer("ex.com/basic")

	tracer.WithSpan(context.Background(), "foo",
		func(ctx context.Context) error {
			tracer.WithSpan(ctx, "bar",
				func(ctx context.Context) error {
					tracer.WithSpan(ctx, "baz",
						func(ctx context.Context) error {
							return nil
						},
					)
					return nil
				},
			)
			return nil
		},
	)
}

See the API documentation for more detail, and the opentelemetry-example-app for a complete example.

Compatible Exporters

See the Go packages depending upon sdk/export/trace and sdk/export/metric for a list of all exporters compatible with OpenTelemetry's Go SDK.

Compatible Libraries

See the opentelemetry-go-contrib repo for packages that facilitates instrumenting other useful Go libraries with opentelemetry-go for distributed tracing and monitoring.

Contributing

See the contributing file.

Release Schedule

OpenTelemetry Go is under active development. Below is the release schedule for the Go library. The first version of the release isn't guaranteed to conform to a specific version of the specification, and future releases will not attempt to maintain backward compatibility with the alpha release.

Component	Version	Release Date
Tracing API	Alpha v0.1.0	November 05 2019
Tracing SDK	Alpha v0.1.0	November 05 2019
Jaeger Trace Exporter	Alpha v0.1.0	November 05 2019
Trace Context Propagation	Alpha v0.1.0	November 05 2019
OpenTracing Bridge	Alpha v0.1.0	November 05 2019
Metrics API	Alpha v0.2.0	December 03 2019
Metrics SDK	Alpha v0.2.0	December 03 2019
Prometheus Metrics Exporter	Alpha v0.2.0	December 03 2019
Context Prop. rename/Baggage	Beta v0.4.0	March 30 2020
OpenTelemetry Collector Exporter	Beta v0.4.0	March 30 2020
Zipkin Trace Exporter	Beta v0.4.0	March 30 2020
OTLP Trace & Metrics Exporter	Beta v0.4.0	March 30 2020