That's devstack. Actually, you can use Fedora Coreos driver since stable/train.

On Sep 26, 2020 07:42, Pierre Riteau <pierre@stackhpc.com> wrote:

Magnum is using Fedora-AtomicHost-29-20190820.0.x86_64.qcow2 in
stable/ussuri and earlier branches:
https://opendev.org/openstack/magnum/src/branch/stable/ussuri/magnum/tests/contrib/gate_hook.sh#L91

On Fri, 25 Sep 2020 at 21:25, Clark Boylan <cboylan@sapwetik.org> wrote:
>
> I'm in the process of removing our fedora-30 images and noticed that we are still mirroring Fedora Atomic 28 and 29 images here: https://mirror.dfw.rax.opendev.org/fedora/atomic/stable/. Are these images in use anywhere? I would like to clean them up as they are even more stale than the fedora-30 nodepool images.
>
> Using http://codesearch.openstack.org I don't see anything using them but that only searches the master branches of our git repos.
>
> Clark
>