Engineering, with the receipts
One query against your runbooks, PRs, Slack engineering channel, and observability dashboard — without a byte crossing the VPC boundary.
Why did p99 spike last Tuesday around 3pm?
- p99 jumped 220 ms → 1.8 s at 14:47, recovered at 15:12.
- Coincides with PR #4821 (auth middleware change) merged at 14:46.
- Datadog shows DB pool exhaustion ~30 s after deploy.
- Revert at 15:11 returned p99 to baseline.