/etc/logcheck/ignore.d.paranoid/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.
1
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ telnetd\[[0-9]+\]: ttloop: peer died$