00938eac64
Automatic merge from submit-queue (batch tested with PRs 43481, 43419, 42741, 43480)
controller: work around milliseconds skew in AddAfter
AddAfter is not requeueing precisely after the provided time and may
skew for some millieseconds. This is really important because controllers
don't relist often so a missed check because of ms difference is
essentially dropping the key. For example, in [1] the test requeues a
Deployment for a progress check after 10s[2] but the Deployment is synced
9ms earlier ending up in the controller not recognizing the Deployment as
failed thus dropping it from the queue w/o any error. The drop is fixed by
forcing the controller to resync the Deployment but we are going to resync
after the full duration.
@deads2k if you don't like this I am going to handle this on a case by case basis
[1] https://github.com/kubernetes/kubernetes/issues/39785#issuecomment-279959133
[2]
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