Zabbix Item that is calculated from other Items.

[ronaspin]

Hi, I have these three Zabbix Agent Items:

• vm.memory.size[used]
• vm.memory.size[cached]
• vm.memory.size[memory]

All these work fine and are returning data every 30 seconds.

My goal is to have an Item that returns the result of the below...
vm.memory.size[used]-(vm.memory.size[cached+]vm.memory.size[memory])

This is because I need to get the memory used as per HTOP and this is the value that gives exactly the same value by HTOP.

[peatb]

This can be done with calculated items:

https://www.zabbix.com/documentation/3.0/manual/config/items/itemtypes/calculated