This file is indexed.

/etc/logcheck/ignore.d.workstation/gdm 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:]-]+ gdm\[[0-9]+\]: [[:alnum:]]+: \(pam_securetty\) access denied: tty ':0' is not secure !$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ gdm\[[0-9]+\]: [[:alnum:]]+: pam_securetty\(gdm:[[:alnum:]]+\): access denied: tty ':0' is not secure !$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ gdm\[[0-9]+\]: gdm_slave_xioerror_handler: Fatal X error - Restarting :[0-9]$