/usr/lib/python3/dist-packages/provisioningserver/templates/pxe/config.commissioning.armhf.template is in python3-maas-provisioningserver 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.
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 8 | DEFAULT execute
LABEL execute
{{# SAY is not implemented in U-Boot }}
KERNEL {{kernel_params | kernel_path }}
INITRD {{kernel_params | initrd_path }}
APPEND {{kernel_params | kernel_command}}
IPAPPEND 2
|