---
upgrade:
  - |
    The type of following config options have been changed
    from string to URI. They are checked whether they follow
    the URI format or not and its scheme.

    - ``api_endpoint`` in the ``ironic`` group
    - ``mksproxy_base_url`` in the ``mks`` group
    - ``html5_proxy_base_url`` in the ``rdp`` group
    - ``serial_port_proxy_uri`` in the ``vmware`` group