Database | MySQL
The Netdata Agent monitors the number of seconds that the replica is behind the master. This alert indicates that the replication SQL thread is far behind processing the source binary log. A constantly high value (or an increasing one) indicates that the replica is unable to handle events from the source in a timely fashion.
This alert is triggered in warning state when the number of seconds that the replica is behind the master is between 5 and 10 and in critical state when it is between 10 and 30 sec.