/etc/maas/templates/pxe/config.poweroff.template is in maas-rack-controller 2.0.0~beta3+bzr4941-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | DEFAULT poweroff
LABEL poweroff
{{poweroff}}
|