etcd - All grpc_code for grpc_method "Watch" is "Unavailable"

Hi,
I noticed, that every grpc_code for grpc_method "Watch" is "Unavailable" in my okd cluster. My plan is to monitor etcd-instances with default prometheus alerts from the etcd-project.
Maybe the watch-connection is not closed correctly and goes into an timeout.

Version

Client Version: 4.7.18
Server Version: 4.7.0-0.okd-2021-08-22-163618
Kubernetes Version: v1.20.0-1093+4593a24e8fd58d-dirty

Steps To Reproduce

1. install okd 4.7
2. Switch to etcd project oc project openshift-etcd
3. Log in to the first etcd member oc rsh etcd-master1.mycompany.com
4. curl -s --cacert "/etc/kubernetes/static-pod-certs/configmaps/etcd-serving-ca/ca-bundle.crt" --cert "/etc/kubernetes/static-pod-certs/secrets/etcd-all-peer/etcd-peer-master1.mycompany.com.crt" --key "/etc/kubernetes/static-pod-certs/secrets/etcd-all-peer/etcd-peer-master1.mycompany.com.key" https://localhost:2379/metrics

Current Result

grpc_server_handled_total{grpc_code="Unavailable",grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"} 1434

Expected Result

grpc_server_handled_total{grpc_code="OK",grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"} 1434

Additional Information

If that behavior is already fixed or it's a false positive, let me know.