SSH上的Git操作性能降级

8月21日，14:00 UTC 已解决 - 2026年8月21日，在14:00至14:07 UTC期间，dotcom 通过 SSH 的 Git 操作出现降级。在影响高峰期，通过 SSH 的成功 Git 操作下降了超过95%，导致大约四分钟内，大多数用户实际上无法通过 SSH 进行克隆、拉取或推送操作。通过 HTTPS 的 Git 操作未受影响。此次事件是由我们负载均衡基础设施中的一个软件缺陷引起的，该缺陷由一次配置变更触发。该缺陷仅在连接经过运行新配置的多层负载均衡器时出现，这意味着在金丝雀测试期间未能检测到。我们通过回滚配置变更来缓解了此事件。我们正在为多层负载均衡器配置增加回归测试覆盖，并改进对通过 SSH 的 Git 操作的监控和告警，以减少未来类似问题的检测和缓解时间。

原文Aug 21 , 14:00 UTC Resolved - On August 21, 2026, between 14:00 and 14:07 UTC, dotcom Git operations over SSH were degraded. Successful Git operations over SSH fell by more than 95% for during the peak impact window, making clone, fetch, or push over SSH effectively unavailable to most users for approximately four minutes. Git operations over HTTPS were not affected. The incident was caused by a software defect in our load-balancing infrastructure that was triggered by a configuration change. The defect only occurred when connections passed through multiple layers of load balancers running the new configuration, which meant it was not detected during canary testing. We mitigated the incident by rolling back the configuration change. We are adding regression coverage for multi-layer load-balancer configurations and improving monitoring and alerting for Git operations over SSH to reduce our time to detection and mitigation of similar issues in the future.