[2025-10-27] Incident Thread

[github-actions[bot]]

❗ An incident has been declared:

Disruption with viewing some repository pages from large organizations

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[github-actions[bot]]

Update

Viewing code in repositories in or forked from very large organizations (200k+ members) are not loading in the desktop web UI, showing a unicorn instead. A fix has been identified and is being tested. Access via git and access to specific pages within the repository, such as pull requests, are not impacted, nor is accessing the repository via the mobile web UI.

[github-actions[bot]]

Update

The fix for this issue has been validated and is being deployed. This fix will also resolve related timeouts on the Access settings page of the impacted repositories and forks.

[github-actions[bot]]

Update

We have deployed the fix and resolved the issue.

[github-actions[bot]]

Incident Resolved

This incident has been resolved.

[github-actions[bot]]

Incident Summary

Between October 23, 2025 19:27:29 UTC and October 27, 2025 17:42:42 UTC, users experienced timeouts when viewing repository landing pages. We observed the timeouts for approximately 5,000 users across less than 1,000 repositories including forked repositories. The impact was limited to logged in users accessing repositories in organizations with more than 200,000 members. Forks of repositories from affected large organizations were also impacted. Git operations were functional throughout this period.

This was caused by feature flagged changes impacting organization membership. The changes caused unintended timeouts for organization membership count evaluations which led to repository landing pages not loading.

The flag was turned off and a fix addressing the timeouts was deployed, including additional optimizations to better support organizations of this size. We are reviewing related areas and will continue to monitor for similar performance regressions.