I think charm-octavia-diskimage-retrofit would be the right place for setting image properties for retrofitted images.
https://github.com/openstack/charm-octavia-diskimage-retrofit/blob/77559282fc46a4adb091614acc0748968e5b5775/src/lib/charm/openstack/octavia_diskimage_retrofit.py#L189-L219
I think charm-octavia- diskimage- retrofit would be the right place for setting image properties for retrofitted images.
https:/ /github. com/openstack/ charm-octavia- diskimage- retrofit/ blob/77559282fc 46a4adb091614ac c0748968e5b5775 /src/lib/ charm/openstack /octavia_ diskimage_ retrofit. py#L189- L219