You could try:
System -> Triggers, Type = Device Event
Create a trigger for SNMP Traps for rogue discovery events from the controller, and have that set to send to an external NMS setup.
(You'd have to setup the external NMS monitoring from AMP Setup -> NMS to get the NMS alert option at the bottom of the trigger setting)
I haven't done this, but it seems like it could work if I knew what the discovery event messages looked like.