Exporters

OpenTelemetryコレクターにテレメトリーを送信し、正しくエクスポートされることを確認してください。 本番環境でコレクターを使用することはベストプラクティスです。 テレメトリーを可視化するために、Jaeger、Zipkin、 Prometheus、またはベンダー固有のようなバックエンドにエクスポートしてください。

使用可能なエクスポーター

レジストリには、PHP 用のエクスポーターのリストが含まれています。

エクスポーターの中でも、OpenTelemetry Protocol (OTLP)エクスポーターは、OpenTelemetryのデータモデルを考慮して設計されており、OTelデータを情報の損失なく出力します。 さらに、多くのテレメトリデータを扱うツールがOTLPに対応しており（たとえば、Prometheus、Jaegerやほとんどのベンダー）、必要なときに高い柔軟性を提供します。 OTLPについて詳細に学習したい場合は、OTLP仕様を参照してください。

このページでは、主要なOpenTelemetry PHP エクスポーターとその設定方法について説明します。

OTLP

To send trace data to a OTLP endpoint (like the collector or Jaeger) you’ll need to use the open-telemetry/exporter-otlp package and an HTTP client that satisfied psr/http-client-implementation:

composer require \
  open-telemetry/exporter-otlp \
  php-http/guzzle7-adapter

To use the gRPC exporter, you will also need to install the open-telemetry/transport-grpc package, and the grpc extension:

pecl install grpc
composer require open-telemetry/transport-grpc

Next, configure an exporter with an OTLP endpoint. For example:

• gRPC
• protobuf
• JSON
• NDJSON

<?php

require __DIR__ . '/vendor/autoload.php';

use OpenTelemetry\API\Signals;
use OpenTelemetry\Contrib\Grpc\GrpcTransportFactory;
use OpenTelemetry\Contrib\Otlp\OtlpUtil;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;

$transport = (new GrpcTransportFactory())->create('http://jaeger:4317' . OtlpUtil::method(Signals::TRACE));
$exporter = new SpanExporter($transport);

$tracerProvider =  new TracerProvider(
    new SimpleSpanProcessor($exporter)
);

<?php

require __DIR__ . '/vendor/autoload.php';

use OpenTelemetry\Contrib\Otlp\OtlpHttpTransportFactory;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;

$transport = (new OtlpHttpTransportFactory())->create('http://jaeger:4318/v1/traces', 'application/x-protobuf');
$exporter = new SpanExporter($transport);

$tracerProvider =  new TracerProvider(
    new SimpleSpanProcessor($exporter)
);

<?php

require __DIR__ . '/vendor/autoload.php';

use OpenTelemetry\Contrib\Otlp\OtlpHttpTransportFactory;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;

$transport = (new OtlpHttpTransportFactory())->create('http://jaeger:4318/v1/traces', 'application/json');
$exporter = new SpanExporter($transport);

$tracerProvider =  new TracerProvider(
    new SimpleSpanProcessor($exporter)
);
$tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');
$tracer->spanBuilder('example')->startSpan()->end();

<?php

require __DIR__ . '/vendor/autoload.php';

use OpenTelemetry\Contrib\Otlp\OtlpHttpTransportFactory;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;

$transport = (new OtlpHttpTransportFactory())->create('http://jaeger:4318/v1/traces', 'application/x-ndjson');
$exporter = new SpanExporter($transport);

$tracerProvider =  new TracerProvider(
    new SimpleSpanProcessor($exporter)
);
$tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');
$tracer->spanBuilder('example')->startSpan()->end();

Then, append the following code to generate a span:

$tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');
$tracer
  ->spanBuilder('example')
  ->startSpan()
  ->end();

To try out the example above, you can run Jaeger in a docker container:

docker run -d --name jaeger \
  -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
  -e COLLECTOR_OTLP_ENABLED=true \
  -p 6831:6831/udp \
  -p 6832:6832/udp \
  -p 5778:5778 \
  -p 16686:16686 \
  -p 4317:4317 \
  -p 4318:4318 \
  -p 14250:14250 \
  -p 14268:14268 \
  -p 14269:14269 \
  -p 9411:9411 \
  jaegertracing/all-in-one:latest

Zipkin

If you’re using Zipkin to visualize traces, you’ll need to set it up first. Here’s how to run it locally in a docker container.

docker run --rm -d -p 9411:9411 --name zipkin openzipkin/zipkin

Install the exporter package as a dependency for your application:

composer require open-telemetry/exporter-zipkin

Update the example to use the Zipkin exporter and to send data to your Zipkin backend:

$transport = \OpenTelemetry\SDK\Common\Export\Http\PsrTransportFactory::discover()
    ->create('http://zipkin:9411/api/v2/spans', 'application/json');
$zipkinExporter = new ZipkinExporter($transport);
$tracerProvider =  new TracerProvider(
    new SimpleSpanProcessor($zipkinExporter)
);
$tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');

Minimizing export delays

Most PHP runtimes are synchronous and blocking. Sending telemetry data can delay HTTP responses being received by your users.

If you are using fastcgi, you could issue a call to fastcgi_finish_request() after sending a user response, which means that delays in sending telemetry data will not hold up request processing.

To minimize the impact of slow transport of telemetry data, particularly for external or cloud-based backends, you should consider using the OpenTelemetry Collector as an agent. The agent can quickly accept, then batch send telemetry data to the backend.