This file is indexed.

/etc/logcheck/ignore.d.server/grinch 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
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ grinch\[[0-9]+\]: host allowed \((cached, )?(checked|no connection|avoiding deadlock)\): [._[:alnum:]-]+$