Description of problem:
Saw this merged upstream PR fixing high CPU usage on drains. https://github.com/kubernetes/kubernetes/pull/95260.
The MCO uses the same/similar code on upgrades as well: https://github.com/openshift/machine-config-operator/blob/08ddac370a125ac1b72c5b80069efd8ae31489b6/vendor/k8s.io/kubectl/pkg/drain/drain.go#L321
We need to backport the patch to 4.6, and likely 4.5 as well.
The current fix is in kubectl master and 1.20 isn't cut yet(that's December) so I have to wait until the backport hits 1.19 via https://github.com/kubernetes/kubernetes/pull/95710 and can get it from there.
*** Bug 1891412 has been marked as a duplicate of this bug. ***
*** Bug 1882000 has been marked as a duplicate of this bug. ***