All openshift TLS artifacts (secrets and configmaps) now have a requirement to have an annotation for user facing descriptions per the metadata registry for TLS artifacts.
https://github.com/openshift/origin/tree/master/tls

There is a guideline for how these descriptions must be written:
https://github.com/openshift/origin/blob/master/tls/descriptions/descriptions.md#how-to-meet-the-requirement

The descriptions for the etcd's TLS artifacts don't meet that requirement and should be updated to point out the required details e.g hostnames, subjects and what kind of certificates the signer is signing.
https://github.com/openshift/origin/blob/8ffdb0e38af1319da4a67e391ee9c973d865f727/tls/descriptions/descriptions.md#certificates-22-1

https://github.com/openshift/cluster-etcd-operator/blob/master/pkg/tlshelpers/tlshelpers.go#L74

See also:
https://github.com/openshift/origin/blob/master/tls/descriptions/descriptions.md#Certificates-85