The Nagios Business Process Addon
The AddOn Business Process View takes results of the single nagios checks out of NDO (Nagios' database) and builds up aggregated states. How they are associated is described in one or more config files. There is the possibility to make "and" conjuctions, "or" conjunction and other... A business process (as defined by such a formula) can be used as a part of another business process. So You can build up a hirachical structure to describe the state of Your Application.