I have created Discovery rule for local /24 network using ICMP ping, for CCTV cameras. [No Zabbix agent can be installed]
Also created action that links hosts to template and adds host to host group.

The problem is that no host is added unless DNS record is present (simulated that with dummy entry in /etc/hosts file).

As I read in documentation, if DNS name failed to resolve, than host is added with IP, but in my case it's not happening.

Screenshot of discovery action is in attachment.