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.
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.