Disruption with some GitHub services
Dec 8, 21:28 UTCDec 8, 22:33 UTC
Duration
1h 5m
Impact
Minor
Root cause
Config change
GitHub, 90 days
68 incidents
Affected
Not listed by the vendor.
Final update
On December 8, 2025, between 21:15 and 22:24 UTC, Copilot code completions experienced a significant service degradation. During this period, up to 65% of code completion requests failed. The root cause was an internal feature flag that caused the primary model supporting Copilot code completions to appear unavailable to the backend service. The issue was resolved once the flag was disabled. To prevent recurrence, we expanded test coverage for Copilot code completion models and are strengthening our detection mechanisms to better identify and respond to traffic anomalies.
Timeline
- Resolved · Dec 8, 22:33 UTC
On December 8, 2025, between 21:15 and 22:24 UTC, Copilot code completions experienced a significant service degradation. During this period, up to 65% of code completion requests failed. The root cause was an internal feature flag that caused the primary model supporting Copilot code completions to appear unavailable to the backend service. The issue was resolved once the flag was disabled. To prevent recurrence, we expanded test coverage for Copilot code completion models and are strengthening our detection mechanisms to better identify and respond to traffic anomalies.
More from GitHub
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 2310:11 UTC | Incident across several services | minor | Ongoing |
| Sep 2022:13 UTC | Incident with Pull Requests | minor | 1h 9m |
| Sep 1720:59 UTC | Elevated rate of errors for OpenAI models provided by Copilot | minor | 50m |
| Sep 1607:20 UTC | Degradation with Gemini 3.8 Flash | major | 10h 28m |
| Sep 1519:11 UTC | Disruption with some GitHub services | minor | 49m |
| Sep 1509:47 UTC | Disruption with some GitHub services | minor | 1h 30m |
Also caused by configuration change
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 2218:20 UTC |  Twilio | Phone Number APIs and Console Were Returning Incorrect 404 ResponsesTwilio | none | 0m |
| Sep 1622:30 UTC |  Cloudflare | Hyperdrive Elevated Origin Connection Failure RatesCloudflare | none | 0m |
| Sep 1211:04 UTC |  Slack | Some customers experiencing blurry image previews and download issuesSlack | minor | 8h 56m |
| Sep 1107:18 UTC |  Snowflake | INC20000213Snowflake | critical | 6h 1m |
| Sep 407:34 UTC | Snowflake | INC20000199Snowflake | critical | 2h 36m |
| Sep 109:58 UTC | Snowflake | INC20000190Snowflake | major | 3h 52m |
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