I have quite hosts with manually installed software, such as MediaWiki,
Nextcloud, etc. With increasing host count, it becomes cumbersome and error
prone to maintain an up-to-date list which host has which software installed
manually. I wish if I could set tags in /etc/apt-dater-host.conf which
find their way into apt-dater's database on refresh. Hosts should be filtered
upon that value.

This would make it easy to dynamically generate a list of all MediaWiki
instances, and update host by host.

Thank you for considering.