OpenTracing shim for OpenTelemetry

This package is intended to help OpenTracing users migrate to OpenTelemetry. The OpenTelemetry documentation provides guidance on how to migrate to OpenTelemetry: https://opentelemetry.io/docs/migration/opentracing/

Installation

API + SDK

This package depends on the OpenTelemetry API, but an OpenTelemetry SDK and an exporter should also be provided to enable exporting spans.

You usually need to supply a PSR-7 and PSR-18 implementation, since most exporters use HTTP to transport telemetry data (gRPC is the exception).

OTLP Exporter

Usually logs are exported to some receiver via the otlp protocol in the protobuf format, via http or gRPC.

This requires:

• a protobuf implementation; either the protobuf extension or the google/protobuf package
• the open-telemetry/exporter-otlp package
• the open-telemetry/transport-grpc package, if using gRPC transport
• a PSR-7 and PSR-18 implementation, if using HTTP transport

Zipkin exporter

OpenTelemetry supports exporting via the zipkin protocol, which requires the open-telemetry/exporter-zipkin package. Traces can be exported to a zipkin instance directly, or to any other service which supports the zipkin protocol.

Setup

To use this package, you need to create an OpenTelemetry tracer provider, which is the only parameter used by the shim tracer:

$tracerProvider = new OpenTelemetry\SDK\Trace\TracerProvider(/*params*/);
OpenTelemetry\SDK\Common\Util\ShutdownHandler::register([$tracerProvider, 'shutdown']);
$tracer = new OpenTelemetry\Contrib\Shim\OpenTracing\Tracer($tracerProvider);

There are a number of ways to set up a tracer provider, please see the official documentation or the examples.

Notes

• OpenTelemetry does not support setting span kind after span creation, so adding a span.kind tag will not set the span's kind. An attribute will still be emitted, though.
• Span::log([/*$fields*/]) will use an event field as the log name, otherwise log.
• errors may be logged via Span::log, using the key exception. A Throwable should be the field's value, but a string is allowable and will be converted to an exception