Hi Thomas,
Yes, we are adding that VM to our internal monitoring system, based on icinga2. We are investigating what consumed the disk space, as it is just a Jenkins worker and should not have had disk space being consumed over time, as the pipelines should be either deleting temporary artifacts or moving longer lived artifacts off the workers to the headnodes (i.e. logs and such), so those items become available through the dashboard, etc.
Our internal monitoring actually utilizes Google Chat, through our company Gsuite account, so it can easily generate notifications to our phones, etc.
Cheers,
LIncoln