Tweak the etcd alert severity

Author: chaitanyaenr

config/alerts

@@ -40,7 +40,7 @@
 
 - expr: up{namespace=~"openshift-etcd"} == 0
   description: "{{$labels.namespace}}/{{$labels.pod}} down"
-  severity: error
+  severity: warning
 
 - expr: up{namespace=~"openshift-.*(kube-controller-manager|scheduler|controller-manager|sdn|ovn-kubernetes|dns)"} == 0
   description: "{{$labels.namespace}}/{{$labels.pod}} down"