nova/doc/api_samples/os-instance-actions/instance-actions-list-resp.json

{
    "instanceActions": [
        {
            "action": "resize",
            "instance_uuid": "b48316c5-71e8-45e4-9884-6c78055b9b13",
            "message": "",
            "project_id": "842",
            "request_id": "req-25517360-b757-47d3-be45-0e8d2a01b36a",
            "start_time": "2012-12-05T01:00:00.000000",
            "user_id": "789"
        },
        {
            "action": "reboot",
            "instance_uuid": "b48316c5-71e8-45e4-9884-6c78055b9b13",
            "message": "",
            "project_id": "147",
            "request_id": "req-3293a3f1-b44c-4609-b8d2-d81b105636b8",
            "start_time": "2012-12-05T00:00:00.000000",
            "user_id": "789"
        }
    ]
}