Kafka topic exported

Expected format

{
    "type": "slice",
    "ts": 1536617075.762331,
    "slice_data": [
        {
            "metrics": {
                "deferreds": 119.0,
                "rss-mb": 106.0
            },
            "metadata": {
                "logical_device_id": "",
                "title": "voltha.internal",
                "serial_no": "",
                "ts": 1536617075.762331,
                "context": {
                    "instance_id": "vcore-0"
                },     "device_id": ""
           
            }
        }
    ]
}