Disruption with Copilot next edit suggestions

Updates timeline

1. Investigating Jun 17, 05:57 PM UTC

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

2. Investigating Jun 17, 06:40 PM UTC

   We have identified a likely cause and are applying a mitigation

3. Investigating Jun 17, 07:09 PM UTC

   We have applied mitigation and are seeing recovery

4. Monitoring Jun 17, 07:14 PM UTC

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

5. Resolved Jun 17, 07:28 PM UTC

   On June 17, 2026, between 16:57 UTC and 19:14 UTC, Copilot code completions were degraded and users were unable to receive Next Edit Suggestions. Standard ghost text code completions were not affected. This was due to a configuration change that caused the service's routing layer to incorrectly discard all Next Edit Suggestion model endpoints as invalid.<br /><br />We mitigated the incident by deploying a corrected configuration change at 18:55 UTC, with full recovery observed at 19:14 UTC.<br /><br />We are working to improve the resilience of our routing layer to limit impact due to a subset of invalid configurations, and to improve our alerting to detect sudden traffic changes that are not captured by standard error rate monitors.