OVN northbound and southbound Databases both have RAFT cluster IDs. See here for more details: https://web.stanford.edu/~ouster/cgi-bin/cs190-winter21/lecture.php?topic=raft

Northbound and southbound both have unique cluster IDs which should not change during normal runtime.

If the cluster values deviate for a period of time, it may indicate database "split brain".

PR that includes the commit for this change: https://github.com/openshift/cluster-network-operator/pull/1526

See commit titled: OVN-K alerts: add ovn db cluster id error