---
upgrade:
  - |
    WSGI application scripts ``nova-api-wsgi`` and ``nova-metadata-wsgi`` are
    now available. They allow running the compute and metadata APIs using a WSGI
    server of choice (for example nginx and uwsgi, apache2 with mod_proxy_uwsgi
    or gunicorn). The eventlet-based servers are still available, but the WSGI
    options will allow greater deployment flexibility.