What does this mean?
Anyone who has deployed Hyperic and wants to leverage its monitoring capabilities to work with Cloud Foundry just needs to activate the plug-in and configure it to point to a Cloud Foundry instance to begin monitoring. The things that Hyperic can monitor inside of Cloud Foundry is pretty detailed, you can find the entire list here.
If you use Cloud Foundry and are a vFabric customer, this is something worth checking out. Here is a screencast/demo of what the plug-in can do.
-The Cloud Foundry Team