/usr/lib/python3/dist-packages/provisioningserver/templates/pxe/config.ephemeral.amd64.generic.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 | DEFAULT execute
LABEL execute
SAY booting ephemeral image...
SAY extra={{ kernel_params.extra_opts }}
KERNEL {{kernel_params | kernel_path }}
APPEND initrd={{kernel_params | initrd_path }} {{ kernel_params.extra_opts }} maas_url={{kernel_params.preseed_url }}
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