Health check endpoint

[brumhard]

📚 Documentation

It would be great to add further documentation to https://grpc-ecosystem.github.io/grpc-gateway/docs/operations/health_check/ and add the example discussed in #1977.

Furthermore the combination of both would be nice to have one http endpoint on the gateway that calls the check method on the grpc server to really have a meaningful result for the health of the whole service.

If possible it would also be nice if it could be added to the options in runtime.NewServeMux like WithHealthCheckEnabled(conn *grpc.ClientConn), to activate a "healthz" route with the described behaviour. I would guess that the need for healthchecks should be common enough for that.
If you think it shouldn't be integrated in this place, maybe there's also another place where this could fit in.

[johanbrandhorst]

Sounds great, would you be willing to help contribute this?

[brumhard]

Sure I'll be happy to look into this 👍

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[brumhard]

Just like PR still stuck in bureaucracy...