In Cloudera Manager., I could always see this Alert in health Tests Section -
NameNode summary: xyz.abc.net (Availability: Unknown, Health: Good), pqr.abc.net (Availability: Unknown, Health: Good). This health test is bad because the Service Monitor did not find an active NameNode.
I do not see any service Disruption and both the servers are up and running. Looking for help what need to be checked and why this heath test alert is persistent.