The openshift cluster operator machine-config has not yet successfully rolled out

Issue

• Upgrade fails with the following error

  # oc get clusterversion
  NAME         VERSION      AVAILABLE      PROGRESSING      SINCE      STATUS
  version      4.7.34        True           False           6h1m       Error while reconciling 4.7.34: the cluster operator machine-config has not yet successfully rolled out
  

• Machine-config operator reported degraded

  $ oc get co machine-config 
  NAME             VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
  machine-config                                4.7.34        False          False            True         4h5m