go-grpc-middleware

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All the metrics currently reported by providers/prometheus have labels as "grpc_type", "grpc_service" and "grpc_method". But since, these do not include source and target endpoint information, it is not possible to get metrics for a particular grpc_service per connection level. These are more like aggregated metrics at grpc_service level.

So requesting to include these two additional labels also.

Example: grpc_server_msg_received_total{grpc_method="RegisterTimer",grpc_service="timergrpc.IpcService",grpc_type="unary"} 4

I will leave this sort of decision to @bwplotka who is significantly more experience with metrics than I am.

@bwplotka looking forward for your response.