TLDR Tech / DevOps
GitHub.com Incident
GitHub suffered a nearly eight-hour incident affecting Issues, Pull Requests, APIs, Actions, Copilot, and authentication, with web/API error rates reaching about 20% and some downloads reaching 50%. A traffic spike exhausted an Istio sidecar's concurrency limit, a misconfigured autoscaling policy prevented it from scaling, and the failure cascaded into overloaded HAProxy nodes. A VS Code retry bug separately amplified Copilot token traffic by roughly 10× and delayed recovery.
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