This file is indexed.

/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$