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GitLab: GitLab Duo Chat (classic) returning errors

Affected components: GitLab Duo

Timeline of updates

1. investigating2025-09-04 23:33 UTC

   Our team is currently investigating an issue with Duo Chat (classic). Users may experience A1004 errors. Duo Chat (Agentic) is working normally

2. investigating2025-09-05 00:07 UTC

   All messages to Duo Chat classic are currently receiving A1004 errors. Duo Chat (Agentic) is working normally. Our team is currently investigating. For more information, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/20483

3. resolved2025-09-05 00:33 UTC

   A recent change has been reverted and confirmed as the cause. Duo chat (Classic) is now working. For details, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/20483

Rewindex changes for this incident

• Major incident: GitLab Duo Chat (classic) returning errors 2025-09-04 23:33 UTC

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