The items we have looked at so far allowed us to query the built-in capabilities of a Zabbix agent, query SNMP devices, and reuse data on the Zabbix server. Every now and then, a need arises to monitor something that is not supported by Zabbix out of the box. The easiest and most popular method to extend Zabbix data collection is user parameters. They are commands that are run by the Zabbix agent and the result is returned as an item value. Let's try to set up some user parameters and see what things we should pay extra attention to.
Just getting it to work
First, we'll make sure that we can get the agent to return any value at all. User parameters are configured on the agent side—the agent daemon contains the key specification, ...
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