Resolution:
Use event service and provide it with a script to send an e-mail (or page) to an administrator. When an agent's heartbeat is not received by the event service, it will execute the script specified at start-up, providing it with two arguments (first argument being the hostname of the expired agent and the second argument being the expired agent's IP address).You may create the script to accept one or both arguments.    Note: the expired agent does not necessarily mean that the agent process terminated.  It only indicates the agent heartbeat is not received by event service.