/etc/logcheck/ignore.d.server/cups-lpd 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 9 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Connection from [._[:alnum:]-]+ \([.0-9]{7,15}\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Print file - job ID = [0-9]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Unknown command-line option "\\" ignored!$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Unknown LPD command [^[:space:]]+!$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Command line = [[:alnum:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Print waiting jobs \(no-op\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Send queue state \((long|short)\) for [._[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Receive print job for [._[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cups-lpd\[[0-9]+\]: Closing connection$
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