/etc/logcheck/ignore.d.workstation/xdm is in logcheck-database 1.3.16.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+[[:space:]]+: \(pam_[[:alnum:]]+\) session opened for user [[:alnum:]-]+ by \(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+[[:space:]]+: \(pam_[[:alnum:]]+\) session closed for user [[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ xdm(: :0)?\[[0-9]+\]: pam_[[:alnum:]]+\(xdm:session\): session opened for user [[:alnum:]-]+ by ([[:alnum:]-]+)?\(uid=[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ xdm(: :0)?\[[0-9]+\]: pam_[[:alnum:]]+\(xdm:session\): session closed for user [[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ xdm(: :0)?\[[0-9]+\]: pam_krb5\(xdm:auth\): user [[:alnum:]-]+ authenticated as [[:alnum:]-]+@[.A-Z]+$
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