With calculated items, you can create calculations on the basis of other items.
Thus, calculated items are a way of creating virtual data sources. The values will be periodically calculated based on an arithmetical expression. All calculations are done by the Zabbix server - nothing related to calculated items is performed on Zabbix agents or proxies.
https://www.zabbix.com/documentation/4.0/manual/config/items/itemtypes/calculated
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