nova/doc/notification_samples/instance-resume-start.json

{
    "event_type": "instance.resume.start",
    "payload":{
        "$ref": "common_payloads/InstanceActionPayload.json#",
        "nova_object.data": {
            "state": "suspended",
            "task_state": "resuming"
        }
    },
    "priority": "INFO",
    "publisher_id": "nova-compute:compute"
}