Changes / GitHub / Copilot Code Review is unable to complete reviews
GitHub: Critical incident: Copilot Code Review is unable to complete reviews
Summary
GitHub reported a critical Copilot Code Review degradation starting 2026-09-28 21:16 UTC, resolved at 2026-09-28 22:08 UTC (51 min). Approximately 70% of requested reviews did not complete across all environments; affected users needed to re-request reviews. GitHub attributed the issue to a dependent-service change and reported a revert underway before recovery.
Machine-written from the diff below (Sol; type: incident degradation). Check the diff before relying on it.
What changed
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After: Copilot Code Review is unable to complete reviews
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After: critical
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After: resolved
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After: 2026-09-28 21:16 UTC
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After: 2026-09-28 22:08 UTC
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After: We are investigating reports of impacted performance for some GitHub services.
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After: Revert of the impacted change is in flight, expect full recovery once the deployment is done.
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After: Copilot Code review has recovered, for reviews that were previously not successful you can re-request review from your PR.
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After: On September 28, 2026, between 19:23 UTC and 22:08 UTC the Copilot Code Review service was degraded and pull request reviews did not complete in all environments. On average, approximately 70% of requested reviews did not complete. Reviews requested during this window were not automatically retried, and users needed to re-request a review from their pull request. This was due to a change in a dependent service that stopped delivering data Copilot Code Review needs to complete a review. Review completion is an inherently delayed signal, because each review job takes time to start and finish, so it took longer to detect the impact.<br /><br />We mitigated the incident by reverting the change.<br /><br />We are working to add a faster signal for reviews that fail to complete, add deployment validation that confirms a Copilot Code Review completes end to end, improve how we track internal dependencies between services, and make our deployment pipeline more reliable to reduce our time to detection and mitigation of issues like this one in the future.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Critical incident: Copilot Code Review is unable to complete reviews (this change) GitHub reported a critical Copilot Code Review degradation starting 2026-09-28 21:16 UTC, resolved at 2026-09-28 22:08 UTC (51 min). Approximately 70% of requested reviews did not complete across all environments; affected users needed to re-request reviews. GitHub attributed the issue to a dependent-service change and reported a revert underway before recovery. | Major incident |