/usr/lib/update-cluster/dsh.updatelist is in dsh 0.25.10-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #! /bin/bash
/usr/bin/update-cluster-parseconfig hostname < "${CLUSTERXML}" > /etc/dsh/machines.list
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