openshift-apiserver cluster-operator goes unavailable during cluster installation or upgrade from OCP 4.6 to 4.7

Issue

• After deploying OCP 4.7 or upgrading OCP cluster from 4.6 to 4.7, multiple clusteroperator goes into the Degraded state.

  authentication                            4.7.0    False      True         True      4d
  console                                   4.7.0    False      False        True      2h20m
  image-registry                            4.7.0    False      True         True      1d
  ingress                                   4.7.0    True       False        True      6h41m
  monitoring                                4.7.0    False      True         True      1m19s
  network                                   4.7.0    True       False        False     3h16m
  openshift-apiserver                       4.7.0    False      False        False     4d
  operator-lifecycle-manager-packageserver  4.7.0    False      True         False     2s
  

• openshift-apiserver cluster-operator shows below logs:

  $ oc get co openshift-apiserver -o yaml | grep "not ready" -A1
  message: 'APIServicesAvailable: "apps.openshift.io.v1" is not ready: 503 (the
    server is currently unable to handle the request)
    APIServicesAvailable: "authorization.openshift.io.v1" is not ready: 503 (the
    server is currently unable to handle the request)
    APIServicesAvailable: "build.openshift.io.v1" is not ready: 503 (the server
    is currently unable to handle the request)
    APIServicesAvailable: "image.openshift.io.v1" is not ready: 503 (the server
    is currently unable to handle the request)
    APIServicesAvailable: "quota.openshift.io.v1" is not ready: 503 (the server
    is currently unable to handle the request)
    APIServicesAvailable: "route.openshift.io.v1" is not ready: 503 (the server
    is currently unable to handle the request)'
  

• Cluster upgrade is stuck at 1% complete:

  $ oc get clusterversion
  NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
  version   4.6.18    True        True          4d22h   Working towards 4.7.0: 8 of 668 done (1% complete)
  $ oc get clusterversion
  NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
  version   4.6.18    True        True          4d22h   Unable to apply 4.7.0: the control plane is reporting an internal error