Enables tracing with OpenTelemetry
The library must be compiled with OpenTelemetry in order for this option to take effect.
The OpenTelemetry tracing quickstart for instructions on how to compile google-cloud-cpp with opentelemetry-cpp.
Setting this option enables the generation of traces by the client library. The library uses the global tracer provider to generate traces.
To create a client that traces, this option must be provided to the
Make*Connection(...) factory functions. It does not have an effect when passed to a client's constructor. If you use custom credentials, this option must also be provided to the
Make*Credentials(...) factory functions in order to trace the authentication components.
Providing this option only enables the generation of traces. It does not enable the export of traces.
In order to export the traces, the application must set the global tracer provider. The client library recommends using
#google::cloud::otel::ConfigureBasicTracing() to configure the global tracer provider. This will send the traces generated by the client library to Cloud Trace, Google Cloud's visualizer for distributed traces.
This option is controlled by the
GOOGLE_CLOUD_CPP_OPENTELEMETRY_TRACING environment variable. If the environment variable is set to a non-empty value, tracing with OpenTelemetry is enabled.