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swap 健康窗扩容：覆盖冷库 eager init 实测耗时 - #497
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rc5 生产换版两连失败实证（2026-10-21）：生产库（beta-mp-pg 刚重启+冷缓存）上， 新建容器的 mu eager schema init 需要 1-3 分钟（首轮 DNS 竞速 ENOTFOUND 一次+ 冷库 DDL 慢），而主健康窗 12×5s（约 1 分钟）与回滚窗 6×1s 均短于该耗时—— rc5 健康门正确等待但窗口先耗尽 → 误回滚；且回滚容器同样处于 init 窗口期， 6×1s 判定过早触发 🛑 误报（实际回滚容器稍后即 mu:True healthy）。 - 主健康窗 12 轮 → 48 轮（5s 间隔不变，约 4 分钟） - 回滚窗 6×1s → 36×2s（约 72 秒） - 18700（小库热态）不受影响（2 轮即过）；本修复由生产实测驱动，无语义变化 测试：release-tools 20/20（mock 首轮即 live，轮数扩容不影响用例时长）
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rc5 生产换版两连失败实证驱动。扩窗后重试将正常通过。详见 commit。