Steps to reproduce:
- Open https://www.zabbix.com/integrations/nginx#tab:official2
- Setup dual stack system where localhost and primary DNS can be resolved to ipv6 or ipv4.
Result - web server is not running/accessible.
Dual stack system will have localhost pointed to the ipv6 and ipv4, and if web server is listen only ipv4 - template will not work. IPv6 has priority if name can be resolved in ipv4 and ipv6.
Notice should be added about IPv6 behaviour of the templates like NGINX/Apache, etc.