/usr/share/pam-configs/cgfs is in libpam-cgfs 2.0.0-0ubuntu2.
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 6 | Name: Create cgroups for user login sessions
Default: yes
Priority: 0
Session-Type: Additional
Session:
optional pam_cgfs.so -c freezer,memory,name=systemd
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