We have one automation case to be executed in Prwo CI cluster of openstack. 
After stopped and started KCM leader master node,  etcd pod will run into CrashLoopBackOff status 
    

$ oc get clusterversion
NAME      VERSION                              AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.18.0-0.nightly-2024-11-14-090045   True        False         5h37m   Cluster version is 4.18.0-0.nightly-2024-11-14-090045

    

always
    

    1. Shutdown the KCM leader master node, 
$ oc debug node/<master node name>
sh-4.2# chroot /host
sh-4.2# poweroff
Make sure the master node has been powered off
$ oc  get node
    2. To verify the cluster works fine with two master nodes, run:
oc login
oc new-project test-project-1
oc new-app aosqe/hello-openshift -n test-project-1
    3. Start the powered off master again. Check the cluster status:
oc get no
oc get co
oc get po -A
    

  1. etcd operator is degraded.
$ oc get co
...
etcd                                       4.18.0-0.nightly-2024-11-14-090045   True        False         True       4h23m   EtcdMembersDegraded: 2 of 3 members are available, qizv777c-4bb48-4vjc4-master-0 is unhealthy...

$ oc describe co/etcd
...
Status:
  Conditions:
    Last Transition Time:  2024-11-15T09:07:28Z
    Message:               EtcdMembersDegraded: 2 of 3 members are available, qizv777c-4bb48-4vjc4-master-0 is unhealthy
StaticPodsDegraded: pod/etcd-qizv777c-4bb48-4vjc4-master-0 container "etcd" is waiting: CrashLoopBackOff: back-off 5m0s restarting failed container=etcd pod=etcd-qizv777c-4bb48-4vjc4-master-0_openshift-etcd(ab2c484f207208c9eb9adb8c2f9b65e4)
    Reason:                EtcdMembers_UnhealthyMembers::StaticPods_Error
    Status:                True
    Type:                  Degraded
    Last Transition Time:  2024-11-15T05:04:14Z
    Message:               NodeInstallerProgressing: 3 nodes are at revision 8
EtcdMembersProgressing: No unstarted etcd members found
    Reason:                AsExpected
    Status:                False
    Type:                  Progressing
    Last Transition Time:  2024-11-15T04:47:13Z
    Message:               StaticPodsAvailable: 3 nodes are active; 3 nodes are at revision 8
EtcdMembersAvailable: 2 of 3 members are available, qizv777c-4bb48-4vjc4-master-0 is unhealthy
    Reason:                AsExpected
    Status:                True
    Type:                  Available
    Last Transition Time:  2024-11-15T04:43:44Z
    Message:               All is well
    Reason:                AsExpected
    Status:                True
    Type:                  Upgradeable
    Last Transition Time:  2024-11-15T04:43:44Z
    Reason:                NoData
    Status:                Unknown
    Type:                  EvaluationConditionsDetected

 $ oc get pod -n openshift-etcd
NAME                                              READY   STATUS             RESTARTS        AGE
...
etcd-qizv777c-4bb48-4vjc4-master-0                4/5     CrashLoopBackOff   11 (119s ago)   4h12m
...

    

Etcd operator should not be degraded.
  

workaround: [https://access.redhat.com/solutions/6962106]