Expose Prometheus metrics

[fpetkovski]

It would be great to get some basic metrics out of the box to help troubleshoot performance issues with the RPC framework.

I am wondering if exposing Prometheus metrics is something the project is interested in having.

[matheusd]

Do you have a list of specific metrics that would be interesting to you?

[fpetkovski]

I would be interested in tracking the number of requests and request latency on both sides of the RPC.

Here are the client and server metrics that can be used for grpc through middlewares.