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

{
    "security_groups": [
        {
            "description": "default",
            "id": 1,
            "name": "default",
            "rules": [],
            "tenant_id": "6f70656e737461636b20342065766572"
        }
    ]
}