Description:

Mon is a general-purpose resource monitoring system. It can be used to
monitor network service availability, server problems, environmental
conditions (i.e., the temperature in a room) or other things. Mon can
be used to test the condition and/or to trigger an action upon failure
of the condition. Mon keeps the testing and action-taking tasks as
separate, stand-alone programs.

Mon is very extensible. Monitors and alerts are not a part of mon, but
the distribution comes with a handful of them to get you started. This
means that if a new service needs monitoring, or if a new alert is
required, the mon server will not need to be changed.