This alert is triggered when the mysql slave replication is completely broken and not running. This makes the environment runninng on a single DB master node without any backup node. That means that we have no failover in case of an incident on main DB.

The database backup script takes backup from the slave node and doest take any backup from the master node.Hence it becomes crucial to have a healthy slave replication sync in place to have an up to date backup of the databases.