[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!

21:47:46 Deleting outdated reference-chroot-metadata.dat
21:47:46 Testing package stretch2buster-rcmd/python-sfepy-doc 2016.2-4
21:58:12 Deleting outdated reference-chroot-metadata.dat
21:58:12 Testing package stretch2buster-rcmd/task-telugu-kde-desktop 3.43
22:04:32 Deleting outdated reference-chroot-metadata.dat
22:04:32 Testing package stretch2buster-rcmd/corebird 1.7.4-2
22:09:03 Deleting outdated reference-chroot-metadata.dat
22:09:03 Testing package stretch2buster-rcmd/task-serbian-desktop 3.43
22:14:18 Deleting outdated reference-chroot-metadata.dat
22:14:18 Testing package stretch2buster-rcmd/astro-all 1.3