This file is indexed.

/etc/maas/templates/uefi/config.local.arm64.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.

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set default="0"
set timeout=0

menuentry 'Local' {
    echo 'Booting local disk...'
    search --set=root --file /boot/grub/grub.cfg
    configfile /boot/grub/grub.cfg
}