Welcome to the RHQ Agent Plugin Plugin documentation.
Yes. Plugin Plugin: a Maven Plugin to help you build RHQ Agent Plugins.
Great. But I know nothing about RHQ Agent Plugings...
Then you'll want to read the Getting Started with RHQ Agent Plugins wiki page first. You can also checkout the How to write a plugin for JBoss ON and RHQ Guide (PDF) - or the more up to date version How to write a plugin.