nova/doc/api_samples/os-server-external-events/event-create-resp.json

{
    "events": [
        {
            "code": 200,
            "name": "network-changed",
            "server_uuid": "ff1df7b2-6772-45fd-9326-c0a3b05591c2",
            "status": "completed",
            "tag": "foo"
        }
    ]
}