We have already seen that Zabbix is great at monitoring hosts but Zabbix is not limited to just collecting information from other hosts. The Zabbix internal items are items Zabbix can monitor to give us some insights on what's going on under the hood. Monitoring the internals is probably not your first task when you start your setup. Zabbix is configured from the start to work well but when your installation grows you will see the need to tweak/optimize some settings.