After you remove an appliance from an HA pair, the alerts that were attributed to it while it was in the pair remain attributed to the pair, and new alerts are attributed to the individual appliance.
Important
After you remove the appliance, the HA pair will be degraded. If the appliance you remove has a restricted license, it must be added to another pair within 90 days, because when the grace period ends, the appliance will lose its detection capabilities. For details, see Licensing requirements.
Prerequisites
Operator or Admin access