Check manual page of jolokia_metrics.perm_gen
Perm Space usage of a JVM
This check allows to monitor the usage of Perm Space
usage on web application servers.
To use this plugin, Jolokia and the agent plugin need to be installed
on the monitored server.
It will then fetch the memory usage from the JMX status info of the remote
Java Virtual Machine.
The name of the application server instance as configured by the agent.
One check is created for each Jolokia instance sent by the agent.