/etc/logcheck/ignore.d.server/su is in logcheck-database 1.3.16.
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:]-]+ su\[[0-9]+\]: (\+|-) (/dev/)?(pts/[0-9]{1,2}|tty[0-9]) [_[:alnum:]-]+:[_[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: Successful su for [[:alnum:]-]+ by [[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: \(pam_[[:alnum:]]+\) session closed for user [[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: \(pam_[[:alnum:]]+\) session opened for user [[:alnum:]-]+ by ([[:alnum:]-]+)?\(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: \+ \?\?\? root:[_[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: pam_[[:alnum:]]+\(su:session\): session closed for user [[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: pam_[[:alnum:]]+\(su:session\): session opened for user [[:alnum:]-]+ by ([[:alnum:]-]+)?\(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ su\[[0-9]+\]: pam_authenticate: Authentication failure$
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