Description of problem:

As part of PR https://github.com/openshift/cluster-etcd-operator/pull/654, etcdHighNumberOfFailedGRPCRequests was reintroduced for non metal IPI clusters in 4.10. For SRE managed clusters, this alert has been noise where the critical alert fires and resolves in 5-10 minutes by itself.

Some of the labels for these alerts are the following:

Labels:
 - alertname = etcdHighNumberOfFailedGRPCRequests
 - endpoint = etcd-metrics
 - grpc_method = Watch
 - grpc_service = etcdserverpb.Watch
 - job = etcd
 - namespace = openshift-etcd
 - openshift_io_alert_source = platform
 - prometheus = openshift-monitoring/k8s
 - service = etcd
 - severity = critical

To highlight, the gRPC service that the alert fires the most for is 'etcdserverpb.Watch'. 

Following runbook https://github.com/openshift/runbooks/blob/master/alerts/cluster-etcd-operator/etcdHighNumberOfFailedGRPCRequests.md hasn't helped resolve the issue.


Version-Release number of selected component (if applicable):
4.10

Actual results:
- etcdHighNumberOfFailedGRPCRequests critical alert is quite noisy which doesn't seem actionable by end user. 

Expected results:
- etcdHighNumberOfFailedGRPCRequests critical alert should fire with valid cause that is actionable by end user.


Additional info:
- https://bugzilla.redhat.com/show_bug.cgi?id=1701154 is long running bugzilla for same alert and is targeted for 4.10 as well.
- The CPU and memory usage across the 3 control plane nodes has remained fairly constant for considering timespan when the alert fired multiple times.
- The single cluster under consideration has fired the critical alert about 25 times.
- Cluster is AWS IPI 4.10.3.