/etc/logcheck/ignore.d.server/ppp 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 12 13 14 15 16 17 18 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: CSLIP: code copyright$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: PPP: version$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: PPP generic driver version [0-9.]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: PPP line discipline registered$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: PPP (BSD|Deflate) Compression module registered$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ kernel: registered device ppp[0-9]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Couldn't increase M[RT]U to [[:digit:]]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Hangup \(SIGHUP\)$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Modem hangup$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Connect time [.[:digit:]]+ minutes\.$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Sent [[:digit:]]+ bytes, received [[:digit:]]+ bytes\.$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: PPP session is [[:digit:]]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Using interface ppp[[:digit:]]$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Cannot determine ethernet address for proxy ARP$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: write: Bad file descriptor \([[:digit:]]+\)$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: (IP|L)CP terminated by peer$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: Connect: ppp[[:digit:]]+ <--> [-_/.[:alnum:]]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pppd\[[[:digit:]]{1,5}\]: (IP|L)CP terminated by peer$
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