Description of problem:

etcd monitoring configuration is completely getting reset when performing an minor upgrade from v3.11.88 to v3.11.98.
Followed the guide[1] to setup etcd monitoring will not come by default when OpenShift Monitoring Stack is set up.So after setting up the etcd monitoring successfully when we upgarde the cluster to a minor version whole etcd monitoring setup is getting disappeared and it reverts to the default OpenShift Monitoring Stack as a result it shows all the etcd targets are down.Minor upgrades shouldn't be doing this as etcd is major component which requires continues monitoring 


How reproducible: Always


Steps to Reproduce:
1.Set up a OpenShift Monitoring Stack on OpenShift v3.11
2.Next setup etcd monitoring as stated from the guide[1]
3.Just upgrade the whole cluster to minor version and boom OpenShift Monitoring stack is reverted back to its original state and etcd config goes missing.

Actual results:

Whole etcd monitoring setup is getting disappeared and it reverts to the default OpenShift Monitoring Stack after a minor cluster update as a result it shows all the etcd targets are down.


Expected results:

Minor upgrades shouldn't be doing this as etcd is major component which requires continues monitoring.So minor cluster upgrades should still persist the configuration moving onto to the next version as well unless there are major breaking changes involved.

Additional info:
[1]- https://docs.openshift.com/container-platform/3.11/install_config/prometheus_cluster_monitoring.html#configuring-etcd-monitoring