youtubebeat/vendor/github.com/elastic/beats/metricbeat/module/system/uptime/_meta/data.json

{
    "@timestamp": "2017-10-12T08:05:34.853Z",
    "beat": {
        "hostname": "host.example.com",
        "name": "host.example.com"
    },
    "metricset": {
        "module": "system",
        "name": "uptime",
        "rtt": 115
    },
    "system": {
        "uptime": {
            "duration": {
                "ms": 522806000
            }
        }
    }
}