Today, hive has several annotations that represents different elements of the cluster's version:

      "api.openshift.com/channel-group": "candidate",
      "api.openshift.com/gate-ocp": "4.13",
      "hive.openshift.io/version-major": "4",
      "hive.openshift.io/version-major-minor": "4.14",
      "hive.openshift.io/version-major-minor-patch": "4.14.0"

Missing here is the pre-release info.
In case a cluster is on "openshift-v4.14.0-ec.4-candidate", the "ec.4" part is not present in the clusterdeployment at all.

With the request from SRE to read the cluster's version directly from the clusterdeployment (OCM-1606), OCM requires the pre-release info to be included in the clusterdeployment.

We prefer to get the complete version as a label:

 "hive.openshift.io/version": "openshift-v4.14.0-ec.4-candidate"

This way CS won't require parsing and merging the different pieces of the version, and can get the version exactly as it would be reported in telemeter.

cc: wkutler@redhat.com