Here is a quick guide for Ubuntu 6.x and 7.x, from the Nagios web site.

SourceLabs’ offering includes: SourceLabs Search Tool for intelligent search of our repository of 10 million issues Tool for gathering, analyzing, and searching messages from SysLog, Log4J, the JVM, etc. The Java Probe for JVM instrumentation Security, operational, and development issues alerts & notifications Advanced pattern matching tools to speed problem i.d. and resolution Log Monitor, Nagios plug-in, Core Dump Monitor and system information Gatherer Inform