The notification module of Intelligent Monitoring Framework (IMF) is the Asynchronous Monitoring Framework (AMF).
AMF is a kernel driver which hooks into system calls and other kernel interfaces of the operating system to get notifications on various events such as:
AMF also interacts with the Intelligent Monitoring Framework Daemon (IMFD) to get disk group related notifications. AMF relays these notifications to various VCS Agents that are enabled for intelligent monitoring.
See About Open IMF.