I monitor everything with xymon, I get emails when there’s a problem. Works like a charm.

Had to read it twice to understand what they WANTED to say

Oh yeah, same. Great writeup, comprehensive and well written, have it bookmarked in case I need to talk to people about Threema.

Maybe “kdeconnect”? It can do that any much more.

Collabora Office together with Nextcloud/Seafile/OCIS/Pydio.

Easily selfhostable and great.