Disruption with some GitHub services

Resolved

On April 9, 2026, between 09:05 UTC and 19:05 UTC, the Copilot coding agent service was degraded and users experienced significant delays starting new agent sessions. Approximately 84% of new agent session requests were delayed across four separate outage waves, with queue wait times peaking at 54 minutes compared to a normal baseline of 15–40 seconds. On average, the error rate was 83.9% and peaked at 97.5% of requests to the service. Approximately 22,700 workflow creations were delayed or failed during the incident.This was due to a bug in our rate limiting logic that incorrectly applied a rate limit globally across all users, rather than scoping it to the individual installation that triggered the limit. A contributing factor was a surge in API traffic from a client update that increased requests to an internal endpoint by 3–4x, which accelerated rate limit exhaustion.We mitigated the incident by disabling the faulty rate limit caching mechanism via feature flag and updating our service to use per-installation credentials for API calls, ensuring rate limits are correctly scoped to individual installations.We have since added automated monitoring and alerting to detect this failure mode proactively, deployed fixes to reduce unnecessary API traffic through caching improvements, and are continuing work to further isolate rate limit scoping across client types to prevent similar issues in the future.This incident shared the same underlying root causes with an incident declared in the time frame https://www.githubstatus.com/incidents/2rqwxl8y7m0j

Monitoring

The degradation has been mitigated. We are monitoring to ensure stability.

Resolved

This incident has been resolved. Thank you for your patience and understanding as we addressed this issue. A detailed root cause analysis will be shared as soon as it is available.

Update

We are investigating an issue affecting GitHub Copilot coding agent. Users may experience significant delays when starting new agent sessions, with jobs remaining queued longer than expected. Our team has identified increased load as a contributing factor and is actively working to restore normal performance.

Update

We are investigating an issue affecting GitHub Copilot coding agent. Users may experience significant delays when starting new agent sessions, with jobs remaining queued longer than expected. Our team has identified increased load as a contributing factor and is actively working to restore normal performance.

Investigating

We are investigating reports of impacted performance for some GitHub services.

Investigating

We are investigating reports of impacted performance for some GitHub services.

Investigating

We are investigating reports of impacted performance for some GitHub services.