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GitLab: Degraded performance for classic Duo chat

Affected components: GitLab Duo

Timeline of updates

1. investigating2026-01-08 03:15 UTC

   We are investigating degraded performance with classic Duo chat. Requests may fail intermittently at this time. For further details, see https://gitlab.com/gitlab-com/gl-infra/production/-/work_items/21059

2. identified2026-01-08 03:51 UTC

   The cause of degraded performance has been identified. We are preparing a code change to revert the recent deployment that introduced the issue. A merge request has been opened to restore functionality: https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/ai-assist/-/merge_requests/4226 For further details, see gitlab.com/gitlab-com/gl-infra/production/-/work_items/21059

3. identified2026-01-08 04:22 UTC

   We're deploying the revert change to production. For further details, see gitlab.com/gitlab-com/gl-infra/production/-/work_items/21059

4. monitoring2026-01-08 04:55 UTC

   We have deployed the changes to production. We're monitoring the situation. For further details, see gitlab.com/gitlab-com/gl-infra/production/-/work_items/21059

5. resolved2026-01-08 05:50 UTC

   We observe no more error on Classic Duo chat and confirm successful responses in the UI. For further details, see gitlab.com/gitlab-com/gl-infra/production/-/work_items/21059

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