{
  "title": "エラー率とチェックアウト完了率を監視しながら新しい決済画面を段階公開する",
  "subtitle": "Checkout v4.2 · production · 2026-09-28監視開始",
  "product": "Northstar Checkout",
  "flag": "checkout-new-payment-flow",
  "stages": [
    { "id": "stage-01", "cohort": "社内ユーザー", "exposurePercent": 5, "holdHours": 4, "owner": "Release Captain", "proceedWhen": "決済エラー率が基準+0.2pt以内、重大障害なし。", "stopWhen": "決済成功率が基準より1pt以上低下、または重複課金が1件でも発生。", "state": "advance", "observation": "4時間観測。重大障害なし、決済成功率は基準内。" },
    { "id": "stage-02", "cohort": "ベータ利用者", "exposurePercent": 25, "holdHours": 12, "owner": "Payments On-call", "proceedWhen": "チェックアウト完了率が比較群より悪化せず、p95応答が2秒以内。", "stopWhen": "重複課金、決済タイムアウト、またはp95が3秒を超過。", "state": "observing" },
    { "id": "stage-03", "cohort": "全地域の新規注文", "exposurePercent": 100, "holdHours": 24, "owner": "Commerce Duty Manager", "proceedWhen": "24時間の監視で成功条件を満たし、サポート問い合わせ増が許容内。", "stopWhen": "重大な決済不整合、規制地域の誤公開、またはSLO違反。", "state": "planned" }
  ]
}