/etc/logcheck/ignore.d.server/libpam-mount 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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ [-[:alnum:]]+\[[0-9]+\]: pam_mount\(mount\.c:[[:digit:]]+\):? realpath of volume "[.[:alnum:]/_-]+" is "[.[:alnum:]/_-]+"$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ [-[:alnum:]]+\[[0-9]+\]: pam_mount\(mount\.c:[[:digit:]]+\): Command successful\.$
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