More details here: https://issues.redhat.com/browse/OCPCLOUD-842
Current alert timings are arbitrary and have some race conditions with MHC and cluster autoscaler that result in flapping for broken nodes.
Scale up machineset, then delete nodes but machine still exist.
Check Alerting, alert MachineWithoutValidNode severity is Warning.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (OpenShift Container Platform 4.6 GA Images), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.