[Ci-users] userspace-containerization-ci-slave06 is offline

Hello,

I've been looking at why all the recent jobs in
https://ci.centos.org/job/user-cont-conu-pr/
are pending.

The first pending job in the queue says 
'userspace-containerization-ci-slave06 is offline', so I checked
https://ci.centos.org/computer/userspace-containerization-ci-slave06/
but don't see anything I could do there to resolve it.

I can 'ssh userspace-containerization at slave06.ci.centos.org' just fine, 
so it doesn't seem to be offline.

What can I do to debug/resolve it ?

Thanks,

Jiri