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mirror of https://github.com/open-telemetry/opentelemetry-go.git synced 2025-04-11 11:21:59 +02:00
Rahul Patel a202f16100
Add observer metric (#474)
* wip: observers

* wip: float observers

* fix copy pasta

* wip: rework observers in sdk

* small fix in global meter

* wip: aggregators and selectors

* wip: monotonicity option for observers

* some refactor

* wip: docs

needs more package docs (especially for api/metric and sdk/metric)

* fix ci

* Fix copy-pasta in docs

Co-Authored-By: Mauricio Vásquez <mauricio@kinvolk.io>

* recycle unused recorders in observers

if a recorder for a labelset is unused for a second collection cycle
in a row, drop it

* unregister

* thread-safe set callback

* Fix docs

* Revert "wip: aggregators and selectors"

This reverts commit 37b7d05aed5dc90f6d5593325b6eb77494e21736.

* update selector

* tests

* Rework number equality

Compare concrete numbers, so we can get actual numbers in the error
message when they are not equal, not some uint64 representation. This
also uses InDelta for comparing floats.

* Ensure that Observers are registered in the same order

* Run observers in fixed order

So the tests can be reproducible - iterating a map made the order of
measurements random.

* Ensure the proper alignment of the delegates

This wasn't checked at all. After adding the checks, the test-386
failed.

* Small tweaks to the global meter test

* Ensure proper alignment of the callback pointer

test-386 was complaining about it

* update docs

* update a TODO

* address review issues

* drop SetCallback

Co-authored-by: Mauricio Vásquez <mauricio@kinvolk.io>
Co-authored-by: Rahul Patel <rghetia@yahoo.com>
2020-03-05 12:15:30 -08:00
2020-03-04 16:12:25 -05:00
2020-03-05 12:15:30 -08:00
2020-03-04 16:12:25 -05:00
2020-03-04 16:12:25 -05:00
2020-03-05 12:15:30 -08:00
2020-03-05 10:12:10 -08:00
2020-03-05 12:15:30 -08:00
2020-02-25 15:52:46 -08:00
2020-02-10 19:36:04 -05:00
2020-03-04 16:12:25 -05:00
2020-03-04 16:12:25 -05:00
2019-05-16 12:05:27 -07:00

OpenTelemetry-Go

Circle CI Docs Go Report Card Gitter

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"
	"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.TraceProvider().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.

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
Jaeger Trace Exporter Alpha v0.1.0 October 28 2019 November 05 2019
Trace Context Propagation Alpha v0.1.0 Unknown November 05 2019
OpenTracing Bridge Alpha v0.1.0 October November 05 2019
Metrics API Alpha v0.2.0 October 28 2019 December 03 2019
Metrics SDK Alpha v0.2.0 October 28 2019 December 03 2019
Prometheus Metrics Exporter Alpha v0.2.0 October 28 2019 December 03 2019
Context Prop. rename/Baggage Alpha v0.3.0 December 23 2019 -
OpenTelemetry Collector Exporter Alpha v0.4.0 January 15 2020 -
Zipkin Trace Exporter Alpha Unknown -
OpenCensus Bridge Alpha Unknown -
Languages
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