node-feature-discovery

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What would you like to be added:

The implementation of the gRPC health server in nfd-master is very simple and naive, in practice only telling that the nfd-master main loop was started and that the program hasn't exited. This could be improved e.g. by including the state of the metrics server, nfd api controller and node updater pool (i.e. healthcheck fails if any of those goes down).

Why is this needed:

More trust on the liveness data.

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