PubSub Tracing in Spring

[kvajjala59]

Hi community,

I'm trying to trace PubSub messaging across different Spring microservices. We are running two Spring microservices on GKE. Service 1 publishes to PubSub and Service 2 subscribes to the same topic. We use the spring-cloud-gcp-trace lib for Tracing in our services. 

I see two approaches to trace PubSubMessages 

1. OpenTelemetry Tracing in the Publisher & Subscriber https://cloud.google.com/pubsub/docs/open-telemetry-tracing
2. Using TracePubSubAutoConfiguration with spring-cloud-gcp-trace

There are no examples for the second option. With option 1 I see an examples where I can trace the message from the publisher to subscriber with time spent in the client libraries. But with option 2 I'm not sure if we will be able to do that. As the spring-cloud-gcp-trace uses Brave instrumentation and not necessarily OpenTelemetry,

The questions are

1. 1. Are these two different things and can coexist?
2. Can I use the trace lib to get the kind of tracing I would get from the open telemetry option?

Thanks

Kishore