/etc/cron.d/apt-cacher is in apt-cacher 1.7.13+deb9u1.
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 | # apt-cacher crontab(5) fragment
#
# min hour day mon dow user command
# Run the report generator.
# Daily.
#
27 4 * * * root test -x /usr/share/apt-cacher/apt-cacher-report.pl && /usr/share/apt-cacher/apt-cacher-report.pl
# Run the cache cleaner.
# Weekly (Sunday) by default, but reduce the frequency if this is too heavy duty for you.
# Add -v to send root an email showing what the script has done.
#
37 4 * * sun root test -x /usr/share/apt-cacher/apt-cacher-cleanup.pl && /usr/share/apt-cacher/apt-cacher-cleanup.pl
# If using the index file patching pdiff code, daily runs are more suitable.
#
#37 4 * * * root test -x /usr/share/apt-cacher/apt-cacher-cleanup.pl && /usr/share/apt-cacher/apt-cacher-cleanup.pl -p
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