nethserver-zabbix integrates the newest Zabbix monitoring system from Zabbix repo to NethServer
Install Zabbix repo:
rpm -ivh http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm
Install nethserver-zabbix, browse to /zabbix and install zabbix via web.
The Zabbix db user password is stored in /var/lib/nethserver/secrets/zabbix
https://community.nethserver.org/t/howto-install-zabbix-3-4/7841
Basic Nethgui setup