PowerFlex: Error INVALID_POSTGRES_INSTANCE_ROLE After 4.8 PFMP upgrade

After upgrade from 4.6 to 4.8 the below alerts is triggered and is not cleared by acknowledging the alert 

these are stale alerts from the old CrunchyData PGO database instances (postgres-ha-cmo1-*) that were replaced by CloudNativePG (postgres-ha-cnpg-*) during the 4.8 upgrade.

The old pods and PVCs are gone, the new CNPG cluster is healthy, but the health monitoring configmap still references the old instances, which is why the alerts keep re-firing. 

1. Check DB health State 

   delladmin@mvm1:~>kubectl get pods -n powerflex | grep post
   configure-postgres-prerequirements-0-hw95r                0/1     Completed   0             47d
   postgres-ha-cnpg-1                                        1/1     Running     0             47d
   postgres-ha-cnpg-2                                        1/1     Running     0             47d
   postgres-ha-cnpg-3                                        1/1     Running     0             86m
   postgres-ha-cnpg-pooler-556778f6fd-2tmd9                  1/1     Running     0             21d
   postgres-ha-cnpg-pooler-556778f6fd-qnp8k                  1/1     Running     0             21d
   postgres-monitor-7fd88546c7-h6tjn                         1/1     Running     0             21d
   postgres-monitor-7fd88546c7-l2wk7                         1/1     Running     0             21d

2. If all DB instanses are Running, manually clear the alerts using this article PowerFlex 4.X: How To Manually Clear Alerts From 4.X PowerFlex Manager UI
3. Restart/delete the presentation-service pod to flush cached state 

kubectl delete pod -n powerflex $(kubectl get pods -n powerflex | grep presentation | awk '{print $1}')