/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:]-]+$
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