How to get etcd endpoints discovered for enabling etcd alerts.

Issue

• How to get etcd endpoints discovered in the kube-system namespace.
• etcd endpoints should be discovered, as without that prometheus doesn't alert on etcd.

$ oc get ep -n kube-system
NAME               ENDPOINTS                                                        AGE
kube-controllers   10.X.X.98:8444,10.X.X.151:8444,10.X.X.7:8444                     1h
kubelet            10.X.X.162:10255,10.X.X.98:10255,10.X.X.151:10255 + 12 more...   1h