{
  "topic": "create custom metrics",
  "worked_example": {
    "metric_name": "Scroll depth",
    "event_parameter": "scroll_depth",
    "readings": [
      42,
      68,
      91,
      55,
      77
    ],
    "sum": 333,
    "average": 66.6
  },
  "checkpoints": [
    "Parameter confirmed numeric in Realtime report",
    "Unit matches what the code sends",
    "24 to 48 hour wait noted"
  ]
}