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.

To install the API and SDK packages,

$ go get -u go.opentelemetry.io/otel

Quick Start

package main

import (
	"context"
	"log"

	"go.opentelemetry.io/otel/api/global"
	apitrace "go.opentelemetry.io/otel/api/trace"
	"go.opentelemetry.io/otel/exporter/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()

	apitrace.GlobalTracer().WithSpan(context.Background(), "foo",
		func(ctx context.Context) error {
			apitrace.GlobalTracer().WithSpan(ctx, "bar",
				func(ctx context.Context) error {
					apitrace.GlobalTracer().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.

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	Target Date	Release Date
Tracing API	Alpha v0.1.0	October 28 2019	November 05 2019
Tracing SDK	Alpha v0.1.0	October 28 2019	November 05 2019
Metrics API	Alpha	October 28 2019	-
Metrics SDK	Alpha	October 28 2019	-
Zipkin Trace Exporter	Alpha	Unknown	-
Jaeger Trace Exporter	Alpha v0.1.0	October 28 2019	November 05 2019
Prometheus Metrics Exporter	Alpha	October 28 2019	-
Trace Context Propagation	Alpha v0.1.0	Unknown	November 05 2019
OpenTracing Bridge	Alpha v0.1.0	October	November 05 2019
OpenCensus Bridge	Alpha	Unknown	-