# GitLab: Major incident: Increased error rate for GitLab Duo Classic

**Summary:** _summary pending_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-12-22 15:38 UTC · Detected: 2026-10-18 05:08 UTC
- [Source: https://status.gitlab.com/pages/incident/5b36dc6502d06804c08349f7/694965e403be63052d1cf45a](https://status.gitlab.com/pages/incident/5b36dc6502d06804c08349f7/694965e403be63052d1cf45a)
- [Company: GitLab](https://rewindex.com/company/gitlab.md)
- Versions: before (none: first archived) → after incident\_version:188/694965e403be63052d1cf45a@ba343cc47844
- Change 1 of 1 for this incident

Incident page (full timeline): [Increased error rate for GitLab Duo Classic](https://rewindex.com/company/gitlab/incidents/694965e403be63052d1cf45a.md)
## What changed

**1. Added: Title**

```diff
+ Increased error rate for GitLab Duo Classic
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-12-22 15:38 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-12-22 17:32 UTC
```

**6. Added: Affected components**

```diff
+ GitLab Duo
```

**7. Added: Update** (investigating) · 2025-12-22 15:38 UTC

```diff
+ We are seeing increased errors for Duo Classic. Users are experiencing Error Code: A1004. For full details, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
```

**8. Added: Update** (investigating) · 2025-12-22 16:01 UTC

```diff
+ We are seeing improvements in the error rate and are continuing investigations. For full details, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
```

**9. Added: Update** (monitoring) · 2025-12-22 16:29 UTC

```diff
+ We are seeing further improvement and are continuing investigations. As a possible workaround, switching to a different model can be used. Full details in https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
```

**10. Added: Update** (resolved) · 2025-12-22 17:32 UTC

```diff
+ We've completed our monitoring period and can confirm Duo Chat is back to operating normally. We appreciate your patience during this time. Full details in https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-12-22 15:38 UTC | Major incident: Increased error rate for GitLab Duo Classic (this change) | outage |

All GitLab changes: [timeline](https://rewindex.com/company/gitlab/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i1d425e9fc8b138 · Markdown: https://rewindex.com/change/i1d425e9fc8b138.md · JSON: https://rewindex.com/api/v1/changes/i1d425e9fc8b138 · Generated 2026-10-18T12:19:11.324Z