{
  "schema_version": 1,
  "chart_type": "cartesian",
  "stack": "percent",
  "meta": {
    "title": "Rollbacks fell from 10.5% to 7.7% of deploys over six months",
    "quality_profile": "showcase"
  },
  "data": {
    "columns": [
      { "id": "month", "type": "date", "values": ["2026-01", "2026-02", "2026-03", "2026-04", "2026-05", "2026-06"] },
      { "id": "succeeded", "type": "number", "unit": "deploys", "values": [180, 190, 178, 195, 188, 186] },
      { "id": "rolled_back", "type": "number", "unit": "deploys", "values": [22, 20, 20, 19, 18, 16] },
      { "id": "failed", "type": "number", "unit": "deploys", "values": [8, 8, 7, 8, 8, 7] }
    ]
  },
  "encoding": {
    "x": { "column": "month", "scale": "time" },
    "y": { "label": "Deploys" }
  },
  "series": [
    { "id": "succeeded", "mark": "area", "y": "succeeded", "label": "Succeeded" },
    { "id": "rolled_back", "mark": "area", "y": "rolled_back", "label": "Rolled back" },
    { "id": "failed", "mark": "area", "y": "failed", "label": "Failed" }
  ],
  "cards": [
    {
      "title": "What the numbers show",
      "items": [
        "Clean deploys rose from 85.7% to 89.0% of the total; rollbacks fell from 10.5% to 7.7%.",
        "Outright failures barely moved, from 3.8% to 3.3%.",
        "Deploy volume stayed within a narrow band (205–222 per month), so these shares reflect real changes in outcome rather than a shifting denominator."
      ]
    }
  ]
}