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Ran 06 Oct 2020 07:19PM UTC

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Committed 06 Oct 2020 07:14PM UTC coverage: 65.28% (-0.07%) from 65.354%

Job # RUN="coverage" CONTAINER="netaccess"

Build Type

push

travis-pro

Committed by

web-flow

Commit Message

Add gRPC Health service to all Boulder services (#5093)

This health service implements the gRPC Health Checking
Protocol, as defined in 
https://github.com/grpc/grpc/blob/master/doc/health-checking.md
and as implemented by the gRPC authors in
https://pkg.go.dev/google.golang.org/grpc/health@v1.29.0

It simply instantiates a health service, and attaches it to the same
gRPC server that is handling requests to the primary (e.g. CA) service.
When the main service would be shut down (e.g. because it caught a
signal), it also sets the status of the service to NOT_SERVING.

This change also imports the health client into our grpc client,
ensuring that all of our grpc clients use the health service to inform
their load-balancing behavior.

This will be used to replace our current usage of polling the debug
port to determine whether a given service is up and running. It may
also be useful for more comprehensive checks and blackbox probing
in the future.

Part of #5074

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