[Piuparts-reports] problem with piuparts-slave detected

[piuparts slave]

Either a test is running for a very long time (but no test
should run longer than an hour), piuparts-slave hangs or is
not running at all or wasn't started with
~piupartss/bin/slave_run - please investigate and take
appropriate measures!

22:30:52 Testing package stretch2buster-rcmd/task-south-african-english-desktop 3.43
22:36:07 Deleting outdated reference-chroot-metadata.dat
22:36:07 Testing package stretch2buster-rcmd/task-bengali-desktop 3.43
22:41:26 Deleting outdated reference-chroot-metadata.dat
22:41:26 Testing package stretch2buster-rcmd/aufs-dev 4.16+20180409-1
22:46:21 Testing package stretch2buster-rcmd/task-ukrainian-desktop 3.43
22:51:01 Deleting outdated reference-chroot-metadata.dat
22:51:01 Testing package stretch2buster-rcmd/tictactoe-ng 0.3.2.1-1.1
23:03:03 Deleting outdated reference-chroot-metadata.dat
23:03:03 Testing package stretch2buster-rcmd/education-desktop-gnome 2.10.25