This page explains how you can monitor your Openfire jabber server with Zabbix.
The steps below require that you have a zabbix agentd running on the Openfire server.
I can not upload a screenshot.
Type: ZABBIX agent
Key: proc.num[java,,,openfire]
Type of information: Numeric
Expression: {Template_App_Openfire:proc.num[java,,,openfire].last(0)}<1