Consider using gRPC metrics from go-grpc-middleware

[AlexZzz]

• Version: 1.9.5
• Platform: any
• Subsystem: server and agnet

Hi! There're standard prometheus metrics that are exposed by grpc-go-middleware. Using it prevents teams from creating hundreds of dashboards about gRPC communication.

It would be nice to see these metrics in spire.

[evan2645]

Thanks for opening this @AlexZzz

As part of this work, we should take a look at what overlap there is (if any) with existing SPIRE metrics. We should probably prefer metrics coming from this package over our own when/where possible.

[github-actions[bot]]

This issue is stale because it has been open for 365 days with no activity.