Zabbix from 3.4 version adds a new monitoring item types Dependent items, depending on monitoring items.
This option is to solve the previous one-key → one-valuemodel, a monitored item can be acquired when the value of the operation, the internal data acquired in the poll Preprocessingpre-segmentation, the value stored into different Item, has reached the high efficiency mode the monitor value acquisition .
This reduces the overhead of zabbix-server poll, but also to avoid a number of acquisition monitored item values caused by multiple values timeliness of inconsistencies.
But also reduces the scripting process engineer these one-key → one-valuejobs.
Official steps: https://www.zabbix.com/documentation/4.0/zh/manual/config/items/itemtypes/dependent_items