NodeBrain is a rule engine for construction of state and event monitoring
applications. It interacts with other monitoring components to perform
simple element state monitoring or complex event correlation based on user
specified rules. It is extended through the development of plug-in modules
using the C API, and servant programs that may be written in any language
to interact with the rule engine via stdin, stdout, and stderr. The package
includes a small set of plug-in modules to provide capabilities typically
required for monitoring applications.