Description of problem:
Minor error in Exporting All Metrics Definitions for a Linux Server example from http://docs.redhat.com/docs/en-US/JBoss_Operations_Network/3.1/html/Dev_Writing_JON_Command-Line_Scripts/monitoring.html


var resources = ResourceManager.findResourcesByCriteria(criteria); << criteria is undefined >>

is called before 

// search for the resource
criteria = new ResourceCriteria();
criteria.addFilterResourceTypeName('Linux')


Fix: 

// search for the resource
criteria = new ResourceCriteria();
criteria.addFilterResourceTypeName('Linux') 

var resources = ResourceManager.findResourcesByCriteria(criteria);