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Vladyslav SimonenkoandGitHub
1916d05702
## What changed? Instrument gRPC dial calls with metrics monitoring connection establishment. This PR adds the following metrics: 1. ServiceDialLatency 2. ServiceDialSuccessCount 3. ServiceDialErrorCount ## Why? Currently the visibility into gRPC dial calls is limited, there are no metrics for how long establishing the connection took, or how many failures we encountered. Since `grpc.NewClient` is "lazy", in the sense that it doesn't establish connection right away, but rather on the first RPC, we need to instrument it via some hooks. This PR uses `grpc.WithContextDialer` to achieve this. gRPC library itself uses platform-specific keep alive hack to use OS defaults for TCP keepalive, but since we are on Go 1.23+ we can simply use newly introduced KeepAliveConfig. ## How did you test it? - [X] built - [X] run locally and tested manually - [X] covered by existing tests - [X] added new unit test(s) - [ ] added new functional test(s) ## Potential risks