- The ``/os-certificates`` API is deprecated, as well as the
``nova-cert`` service which powers it. The related config option
``cert_topic`` is also now marked for deprecation and may be removed as
early as 15.0.0 Ocata release. This is a vestigial part of
the Nova API that existed only for EC2 support, which is now
maintained out of tree. It does not interact with any of the rest
of nova, and should not just be used as a certificates as a
service, which is all it is currently good for.