This file is indexed.

/etc/logcheck/ignore.d.server/ddclient 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.

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^\w{3} [ :0-9]{11} [._[:alnum:]-]+ ddclient\[[[:digit:]]+\]: SUCCESS:  updating [._[:alnum:]-]+: good: IP address set to [:[:xdigit:].]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ ddclient\[[[:digit:]]+\]: WARNING:  forcing update of [._[:alnum:]-]+ from [:[:xdigit:].]+ to [:[:xdigit:].]+; [[:digit:]]+ days since last update on \w{3} \w{3} [ :0-9]{16}\.$