{
  "observations": [
    {
      "buffered": true,
      "immediate": "",
      "later": "/one\n",
      "observed_after_seconds": 1.006
    },
    {
      "buffered": false,
      "immediate": "/one\n",
      "later": "/one\n",
      "observed_after_seconds": 0.001
    }
  ],
  "scope": "实际可见时间，不承诺flush毫秒精度"
}