/etc/logcheck/ignore.d.server/systemd-timesyncd 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 | ^[[:alpha:]]{3} [ :[:digit:]]{11} [._[:alnum:]-]+ systemd-timesyncd\[[[:digit:]]+\]: interval/delta/delay/jitter/drift [[:digit:]]+s/[+-]([[:digit:]]+\.[[:digit:]]{3}s/){3}[+-][[:digit:]]+ppm$
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