[gRPC-Python] tracing for retries

[Kyle Strand]

How can I enable tracing for retries in Python? The retry-stats gRFC, A46, says:

> The gRPC tracing module should create a tracing span for each call from the perspective of the application, and create a child span for each individual call attempt, including transparent retry attempts.

I don't see any such spans created by the opentelemetry-instrumentation-grpc contrib package (I only see a single span created per gRPC call), so I tried adding the `grpcio-observability` package and enabling it as follows:

```python

grpcio_plugin = grpc_observability.OpenTelemetryPlugin()
grpcio_plugin.register_global()

```

This didn't seem to result in any new traces. I see that there's also an `OpenTelemetryObservability` class, which has a function called `create_client_call_tracer`, but it doesn't appear to be re-exported by `grpc_observability/__init__.py`, which makes me think it might not be intended for public consumption; and it also isn't used in the observability example code.

How can tracing for retries be collected and exported?

Thanks,

Kyle Strand

[Xuan Wang]

Hi Kyle, 

The gRFC you mentioned above was not implemented in Python yet. We have a new gRFC for OpenTelemtry Tracing in progress which will be implemented in Python once it's finished.

Our `grpcio-observability` package currently only works for metrics, it does have some functions for tracing but it's not fully implemented yet.

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[Kyle Strand]

Okay, thank you for explaining.