/etc/maas/templates/uefi/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 5 6 7 | set default="0"
set timeout=0
menuentry 'Power Off' {
echo 'Powering off...'
halt
}
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