nova/doc/api_samples/os-server-groups/server-groups-get-resp.json

{
    "server_group": {
        "id": "5bbcc3c4-1da2-4437-a48a-66f15b1b13f9",
        "name": "test",
        "policies": ["anti-affinity"],
        "members": [],
        "metadata": {}
    }
}