nova/doc/api_samples/os-server-groups/v2.64/server-groups-list-resp.json

{
    "server_groups": [
        {
            "id": "616fb98f-46ca-475e-917e-2563e5a8cd19",
            "name": "test",
            "policy": "anti-affinity",
            "rules": {"max_server_per_host": 3},
            "members": [],
            "project_id": "6f70656e737461636b20342065766572",
            "user_id": "fake"
        }
    ]
}