Fail2Ban in 2023

[bertalanimre]

The Fail2Ban template (https://github.com/zabbix/community-templates/blob/main/Applications/Firewall/template_fail2ban/6.0/README.md) is very out of date at the moment and does not work for the latest version of Zabbix.

With one small fix, I was able to fix at least the service status report, so the templace is good to see if Fail2Ban is alive or dead.

Line: 54 and 66
proc.num[f2b/server]
to
proc.num[python3,,,fail2ban-server]'

However, discovery of jails and listing of banned IP-s is still an issue. Zabbix responds with Unsupported item key.. If anyone can help, it would be amaizing.

Thanks !