an n8n workflow to run every day and check how long since we don’t see devices.
a message is sent via instant message to the owner of the device.
the only problem I found is that Syncthing does not have a place to store data about the device, in my case I needed to store the owner so that I know who to notifiy via IM, in the end I used the device name with a “device name +owner” format for the devies that need notification.