[I] Provide a grpc.health.v1 health checking service [pekko-grpc]

["pjfanning (via GitHub)" <gi...@apache.org>]

pjfanning opened a new issue, #930:
URL: https://github.com/apache/pekko-grpc/issues/930

   Pekko gRPC has no built-in implementation of the standard gRPC health checking service, `grpc.health.v1.Health` (https://github.com/grpc/grpc/blob/master/doc/health-checking.md). `server/kubernetes.md` only describes HTTP health checks.
   
   Kubernetes gRPC liveness/readiness probes, grpc-health-probe, Envoy and other load balancers expect this service. grpc-java provides `HealthStatusManager`.
   
   Proposal:
   - Provide a `grpc.health.v1` service implementation with Scala and Java APIs, like `ServerReflection`.
   - Support `Check` and `Watch`, and a way to set the serving status per service (and for the empty overall service name).
   - Document how to add it to a server, and how to use it with Kubernetes gRPC probes.
   


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