/usr/share/ldm/rc.d/K99-ltsp-cluster is in ldm 2:2.2.19-1.
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 | # Register the session with the Control Center
if [ -f /etc/ltsp/getltscfg-cluster.conf ]; then
getltscfg-cluster -l logout
fi
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