Key concepts : HA heartbeat & synchronization : Data that is not synchronized by HA
 
Data that is not synchronized by HA
In addition to HA configuration, some data is also not synchronized.
Log messages — These describe events that happened on that specific appliance. After a failover, you may notice that there is a gap in the original active appliance’s log files that corresponds to the period of its down time. Log messages created during the time when the standby was acting as the active appliance (if you have configured local log storage) are stored there, on the original standby appliance. For more information on configuring local log storage, see “Configuring logging”.
Generated reports — Like the log messages that they are based upon, PDF, HTML, RTF, and plain text reports also describe events that happened on that specific appliance. As such, report settings are synchronized, but report output is not. For information about this feature, see “Reports”.
See also
Configuring a high availability (HA) FortiADC cluster
Configuration settings that are not synchronized by HA
HA heartbeat & synchronization