/etc/cobbler/pxe/pxeprofile.template is in maas-provision-common 2.2.2-0ubuntu4.
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 | LABEL $profile_name
kernel $kernel_path
$menu_label
$append_line
ipappend 2
|