/etc/logcheck/ignore.d.workstation/proftpd 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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ proftpd\[[0-9]+\]:? [._[:alnum:]-]+ \([:._[:alnum:]-]+\[[.:[:xdigit:]]+\]\)(:| -) Maximum login attempts \([[:digit:]]+\) exceeded$
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