I'd like to know when a host stops polling into the CSA MC. Is it possible to create an alert to be sent via email or an SNMP trap when an agent hasn't polled into the MC for a specified period of time?
A quick solution for now is to create an event set and email alert using the event type 'Management Center: Hosts not actively polling found' that will email you with a list of inactive hosts. The event is generated every 24 hours and contains all hosts not activelty polling.
Hosts are considered inactive if they have missed three polling intervals or not polled the MC in the past 24 hours.
Without digging further I don't know of other options.