(more generically useful) Controller manager restarts more than N in Y duration

[philbrookes]

come up with an alert query that will allow a user to specify that if the controller manager restarts more than N in Y duration an alert will fire.

This will need to be tested that it does fire when expected.

Also some details on potential causes, and how to investigate and troubleshoot.

recreate by killing the operator pod more than N times in Y duration.