This file is indexed.

/etc/logcheck/ignore.d.server/telnetd 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:]-]+ in\.telnetd\[[[:digit:]]+\]: connect from [._[:alnum:]-]+ \([:[:xdigit:].]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ telnetd\[[[:digit:]]+\]: ttloop: peer died: EOF$