/etc/logrotate.d/cron-apt is in cron-apt 0.9.0.
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 | /var/log/cron-apt/log {
	weekly
	missingok
	rotate 4
	compress
	notifempty
	create 640 root adm
	sharedscripts
}
 |