Disruption with some GitHub services
Dec 18, 17:36 UTCDec 18, 19:09 UTC
Duration
1h 33m
Impact
Major
Root cause
Deployment
GitHub, 90 days
68 incidents
Affected
Not listed by the vendor.
Final update
On December 18, 2025, between 16:25 UTC and 19:09 UTC the service underlying Copilot policies was degraded and users, organizations, and enterprises were not able to update any policies related to Copilot. No other GitHub services, including other Copilot services were impacted. This was due to a database migration causing a schema drift. We mitigated the incident by synchronizing the schema. We have hardened the service to make sure schema drift does not cause any further incidents, and will investigate improvements in our deployment pipeline to shorten time to mitigation in the future.
Timeline
- Resolved · Dec 18, 19:09 UTC
On December 18, 2025, between 16:25 UTC and 19:09 UTC the service underlying Copilot policies was degraded and users, organizations, and enterprises were not able to update any policies related to Copilot. No other GitHub services, including other Copilot services were impacted. This was due to a database migration causing a schema drift. We mitigated the incident by synchronizing the schema. We have hardened the service to make sure schema drift does not cause any further incidents, and will investigate improvements in our deployment pipeline to shorten time to mitigation in the future.
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 deployment or rollout
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 1106:22 UTC |  Cloudflare | Issues with Workers VPC hostname route resolution on 2026-09-11Cloudflare | none | 0m |
| Aug 2000:31 UTC |  Box | [Medium] Issue with Microsoft Office Integration and Box EditBox | major | 1h 13m |
| Aug 622:22 UTC |  Slack | Trouble Using Search Bar For Some AdminsSlack | minor | 2h 44m |
| Jul 2110:23 UTC |  dbt Labs | Job runs failing at the git clone stepdbt Labs | critical | 2h 29m |
| Jul 1907:33 UTC | dbt Labs | Some EMEA customers experiencing Git clone failures (403 errors) on thier accountsdbt Labs | major | 6h 22m |
| Jul 200:17 UTC |  Sentry | Traces, spans, logs inaccesible for query or ingestion in de and usSentry | none | 3h 39m |
From vendors' own status pages and disclosures. Times as reported. Logos via logo.dev; trademarks belong to their owners.