生產環境早就裝不進任何人的腦袋。 Polylane 全部裝得下：雲端、程式碼與遙測資料，在同一張即時的圖裡。

// Which deploy slowed checkout-edge?
const deploys = await tools.deployHistory({ service: "checkout-edge", hours: 24 });
const { points } = await tools.queryMetrics({
  service: "checkout-edge",
  metric: "latency.p99",
  hours: 24,
});

const median = (xs) => xs.sort((a, b) => a - b)[xs.length >> 1] ?? 0;
const p99 = (t, side) =>
  median(points.filter((p) => (side < 0 ? p.t < t : p.t > t)).map((p) => p.v));

// Score every deploy by the p99 shift across its timestamp.
const [worst] = deploys
  .map((d) => ({ ...d, shift: p99(d.at, 1) / p99(d.at, -1) }))
  .sort((a, b) => b.shift - a.shift);

// Pull the error logs right after the suspect deploy.
const errors = await tools.queryLogs({
  service: "checkout-edge",
  level: "error",
  after: worst.at,
  limit: 5,
});

// Only this returns; the series and logs stay in the sandbox.
return {
  deploy: worst.sha, // 9f3c2a1
  p99Shift: worst.shift, // 4.8
  topError: errors[0]?.message, // "Hyperdrive pool exhausted"
};