13 Upgrade notes for 3.4.3
Exit code checking
Checking the exit code has been removed from external checks, user
parameters and system.run 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.