Monthly active users

{
  "schemaVersion": 1,
  "type": "line",
  "title": "Monthly active users",
  "description": "Usage grew through May. April has no reported value and is shown as a gap.",
  "source": "Example data",
  "categoryAxis": {
    "title": "Month"
  },
  "valueAxis": {
    "title": "Active users",
    "format": "number"
  },
  "data": [
    {
      "label": "January",
      "value": 1200
    },
    {
      "label": "February",
      "value": 1460
    },
    {
      "label": "March",
      "value": 1390
    },
    {
      "label": "April",
      "value": null
    },
    {
      "label": "May",
      "value": 1810
    },
    {
      "label": "June",
      "value": 2050
    }
  ]
}