This container is just official Zabbix Agent image. Any Zabbix Server configuration/setup will need to be completed by yourself.
To set this container up just edit the following:

• "ZABBIX_SERVER_HOSTNAME" to your Unraid server hostname
• "ZABBIX_SERVER_IP" to the IP address of your Zabbix Server or Proxy

If you would like Zabbix to monitor disks as well as system resources you will need to add each one as a path manually.
Please view the guide available on the forums.