Symfony OpenTelemetry client Bundle

This bundle provides configured official otel bundle for Symfony application under the hood. In addition, it provides a general way to configure telemetry collection via configuration list of Kernel listeners.

Setup bundle

Enable bundle in your Symfony application:

return [
    Macpaw\SymfonyOtelBundle\SymfonyOtelBundle::class => ['all' => true],
    // ...
];

Configuration understanding

This bundle is a decoration under https://github.com/opentelemetry-php/contrib-sdk-bundle to simplify integration with the official bundle and provide generic kernel listeners for data tracing. If you want to get more information about configuration, please refer to the official bundle documentation.

Setup bundle

Kernel event listeners

Example of kernel event listener implementation can be found in Macpaw\SymfonyOtelBundle\Span\ExecutionTimeSpanTracer class. When specific listener need to be configured, you need to add it to span_tracers list in configuration after implementation.

Example

1. Create a custom span tracer class:

   namespace Macpaw\SymfonyOtelBundle\Span;
   
   use Symfony\Component\EventDispatcher\EventSubscriberInterface;
   use OpenTelemetry\API\Trace\Span;
   
   class CustomSpanTracer implements EventSubscriberInterface
   {
       public function onKernelRequest(RequestEvent $event): void
       {
           $span = Span::startSpan('custom_span');
           // Add custom tracing logic here
           $span->end();
       }
   
       public static function getSubscribedEvents(): array
       {
           return [
               KernelEvents::REQUEST => 'onKernelRequest',
           ];
       }
   }

2. Register the custom span tracer in the Symfony configuration:

   # config/packages/symfony_otel.yaml
   symfony_otel:
       span_tracers:
           - App\Span\CustomSpanTracer

Environment Variables

This bundle supports the following OpenTelemetry SDK environment variables for configuration:

• OTEL_RESOURCE_ATTRIBUTES: Key-value pairs to be used as resource attributes.
• OTEL_SERVICE_NAME: The name of the service.
• OTEL_TRACES_EXPORTER: The exporter to be used for traces.
• OTEL_METRICS_EXPORTER: The exporter to be used for metrics.
• OTEL_LOGS_EXPORTER: The exporter to be used for logs.
• OTEL_EXPORTER_OTLP_ENDPOINT: The endpoint for the OTLP exporter.
• OTEL_EXPORTER_OTLP_HEADERS: Headers to be sent with each OTLP request.
• OTEL_EXPORTER_OTLP_TIMEOUT: Timeout for OTLP requests.
• OTEL_PROPAGATORS: Propagators to be used for context propagation.
• OTEL_TRACES_SAMPLER: The sampler to be used for traces.
• OTEL_TRACES_SAMPLER_ARG: Arguments for the trace sampler.

For a complete list and detailed descriptions, please refer to the OpenTelemetry SDK Environment Variables documentation.