9 Running agent as root

This means that the old functionality of configuring which user Zabbix agent runs as via file is bypassed and agent will always run as the user specified in the systemd service file.

Reload daemons and restart the zabbix-agent service:

For old agent this only re-enables the functionality of configuring user in the zabbix_agentd.conf file. Therefore in order to run zabbix agent as root you still have to edit the agent configuration file and specify User=root as well as options.