Steps to reproduce:

1. Setup Zabbix 5.0.15 (agent2 + server)
2. Use "Template OS Linux by Zabbix agent"
3. Inspect discovered network interfaces

Result:
The network discovery on Linux discovers many `vethAABBCC` interfaces. The linked template "Template Module Linux network interfaces by Zabbix agent" ignores veth interfaces, but only those with a lowercase identifier such as `vethaabbcc`. Please consider to set {$NET.IF.IFNAME.NOT_MATCHES} to

(^Software Loopback Interface|^NULL[0-9.]$|^[Ll]o[0-9.]$|^[Ss]ystem$|^Nu[0-9.]*$|^veth[0-9a-zA-Z]$|docker[0-9]|br-[a-z0-9]{12})