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13 Upgrade notes for 3.4.3

Exit code checking

Checking the exit code has been removed from external checks, user parameters and items. These checks will not to become unsupported if the exit code is different than zero. Exit code checks are now only performed in custom alert scripts, remote commands and user scripts executed on Zabbix server and proxy.

Grey caption in graphs

The grey caption displayed at the bottom right of a graph indicating where the data come from (history/trends) is now vertical and displayed only for the users who have frontend debug mode activated.