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How to use Nova or download instances with no controller

Hello so we had a Mitaka controller that became hosed when we tried updating things. So now we have no controller. All of our instances are under /var/lib/nova/instances on the compute.... How can I download them without being able to source my environment and not being able to use nova on the compute? Any suggestions? Nova list asks for all of the information but I cannot source anything bcause we do not have a controller anymore. We would like to move all of the instances to a new Rocky openstack cluster.