Active monitors are the WhatsUp Gold feature responsible for watching over device services. Active monitors regularly query or poll the device services for which they are configured and wait for responses. If a query is returned with an expected response, the queried service is considered "up." If a response is not received, or if the response is not expected, the queried service is considered "down" and a state change is issued on the device.
Active monitors are stored in and configured from the Active Monitor Library.