Adopt health checks in sharedmain

[pmorie]

Currently, we do not use health checks in our controllers descended from sharedmain. Adopting health checks will allow us to begin reporting controllers as unhealthy so that they are restarted by the kubelet. For example, we will be able to use the leaderelection health checker to begin reporting unhealthy after the leader election timeout elapsed when renewing the leader election lease.

/kind feature

Expected Behavior

Controllers can report themselves as unhealthy so that they can be restarted.

Actual Behavior

That doesn't happen.

[github-actions]

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[afrittoli]

/open

[afrittoli]

/lifecycle frozen

[mattmoor]

We should use the shared drainer logic, but probably have something that does this over HTTP (no need for TLS)

[mpetason]

/assign

I'll take a shot at this.

[mpetason]

Unassigned so someone can resolve this faster than I can.