OpenTelemetry OnException events

[vadimi]

What version of gRPC and what language are you using?

Grpc 2.39.0

What operating system (Linux, Windows,...) and version?

Linux

What runtime / compiler are you using (e.g. .NET Core SDK version dotnet --info)

.net5

What did you do?

I'm trying to use OpenTelemetry instrumentation in grpc server. It works fine except errors - they never get captured by OpenTelemetry. Based on open-telemetry/opentelemetry-dotnet-contrib#1743 "Exception" events are not being emitted by the grpc library. Is there a plan to support OnException events going forward?

What did you expect to see?

OpenTelemetry captures errors from grpc endpoints

What did you see instead?

Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).

See TROUBLESHOOTING.md for how to diagnose problems better.

Anything else we should know about your project / environment?

[shirhatti]

The semantic conventions for exceptions are still experimental and as such it's not a good candidate for inclusion in grpc-dotnet.

In the meanwhile, it's better suited for inclusion either in an instrumentation package (up to the OpenTelemetry .NET project) or as user code.

If you want to implement it yourself, you can write an interceptor to catch exception and add it the the current activity (serverCallContext.GetHttpContext().Features.Get<IHttpActivityFeature>()?.Activity.AddEvent(...))

@JamesNK and @captainsafia for their thoughts?

[captainsafia]

@shirhatti Agree with your assessment that it's probably not something we want to build on until the specification is stable.

@rafikiassumanimsft Any particular reason this was marked for 6.0? I think we can probably backlog with a note to re-examine once the spec is ready.

[ovidiubuligan]

What is the status of this issue ? Will it ever be implemented ?

[JamesNK]

No. It's still experimental.

[leidegre]

They are stable. As of December, 2023.

https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/exceptions.md