I’ve got many users on my box and for whatever reason, sometimes the sync client has problems sync’ing data; it can be many reasons, like dns not working and it doesn’t really matter…
, but, I’d like to find out how long since they’ve been sync’ing, like a “last seen” list.
You can use the occ-command to see the last login (can be also for calendar or contacts, it doesn’t have to be the sync-client): sudo -u www-data php /path/to/nextcloud/occ user:lastseen username
The server currently doesn’t know what the clients are syncing and if it was successful. As a user you can decide not to sync certain folders. That’s a new feature → moved to feature request.