/etc/logcheck/ignore.d.server/pure-ftpd is in logcheck-database 1.3.17.
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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([?.[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] New connection from [._[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([?.[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] [._[:alnum:]-]+ is now logged in$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] Can't change directory to .+: (No such file or|Not a) directory$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] Timeout - try typing a little faster next time$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] Timeout \(no new data for [0-9]+ seconds\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] Logout\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[NOTICE\] .+ (up|down)loaded \([0-9]+ bytes, [0-9]+.[0-9]+KB/sec\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[NOTICE\] File successfully renamed or moved: \[.+\]->\[.+\]$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([._[:alnum:]-]+@[._[:alnum:]-]+\) \[NOTICE\] Deleted .+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: \([.[:alnum:]-]+@[._[:alnum:]-]+\) \[INFO\] Timeout$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pure-ftpd: PAM-listfile: Refused user [._[:alnum:]-]+ for service pure-ftpd$
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