/etc/logcheck/ignore.d.server/systemd is in logcheck-database 1.3.18.
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 | ^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: (Started|Reached|Stopped) target [ +[:alnum:]]+\.$
^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: (Starting|Stopping) [ +[:alnum:]/]+\.(\.\.)?$
^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: (Start|Stopp)ed [ +[:alnum:]/]+\.$
^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: Reloading\.$
^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: Time has been changed$
^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]\-]+ systemd\[[0-9]+\]: [-_[:alnum:]]+.timer: Adding ([0-9]+h )?([0-9]{1,2}min )?[0-9]{1,2}\.[0-9]{6}s random time\.$
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