/etc/cron.d/piuparts-slave is in piuparts-slave 0.56ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | # m h dom mon dow (0|7=sun,1=mon) command
#
# start slave_run automatically after reboots
#
#@reboot /usr/share/piuparts/slave/slave_cleanup ; /usr/share/piuparts/slave/slave_run
#
# monitor slave session every hour
#
#16 * * * * /usr/share/piuparts/slave/detect_slave_problems
#
# monitor for problems every six hours
#
#23 */6 * * * /usr/share/piuparts/slave/detect_leftover_processes
#
# monitor for cruft in the temporary directory once a day
#
#00 0 * * * /usr/share/piuparts/slave/detect_tmp_cruft
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