Request to Include OpenTelemetry Metrics for Cloud-Streams

[SonaThaj]

What would you like to be added?

Request to add OpenTelemetry metrics instrumentation for observing inbound and outbound events.

Proposal(s):

It would be great to start with the following metrics:

1. Ingestion Rate Overall
2. Ingestion Rate per Stream?
3. Publication Rate Overall
4. Publication Rate per Stream?
5. Publication Rate per Subscriber?
6. Delivery Failures

Thank you for your consideration.