/etc/logcheck/ignore.d.paranoid/cron is in logcheck-database 1.3.18.
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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/USR/SBIN/)?CRON\[[0-9]+\]: \([_[:alnum:]-]+\) CMD \(.*\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/usr/sbin/)?cron\[[0-9]+\]: \(CRON\) STARTUP \(fork ok\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/usr/sbin/)?cron\[[0-9]+\]: \([^[:space:]]+\) RELOAD \([^[:space:]]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/usr/sbin/)?cron\[[0-9]+\]: \(CRON\) INFO \(pidfile fd = [0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/usr/sbin/)?cron\[[0-9]+\]: \(CRON\) INFO \(Running @reboot jobs\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (/usr/sbin/)?cron\[[0-9]+\]: \(CRON\) INFO \(Skipping @reboot jobs -- not system startup\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ CRON\[[0-9]+\]: \(pam_[[:alnum:]]+\) session (opened|closed) for user [[:alnum:]-]+( by \(uid=[0-9]+\))?$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ CRON\[[0-9]+\]: pam_[[:alnum:]]+\(cron:session\): session (opened|closed) for user [[:alnum:]-]+( by \(uid=[0-9]+\))?$
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