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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add healthz check to ensure logging is not blocked When running the apiserver/controllers in pods, we encountered a docker bug that blocked stdout/stderr (https://github.com/moby/moby/issues/31373) That in turn blocked flushing logs, which in turn eventually blocked any goroutine that logs anything (which is pretty much all the important goroutines) This adds a healthz check that logging is not blocked so that healthz indicates something is wrong ```release-note NONE ```