2026-01-08: Classic Duo Chat does not work when using doc tool

Classic Duo Chat does not work when using doc tool (Severity 3)

Problem: Classic Duo Chat failed with a 'Data store not found' error when users tried to use the doc tool.

Impact: Users were unable to use the doc tool in Classic Duo Chat until the issue was fixed. Requests to Duo failed with errors due to missing data stores. The feature is now working again after the fix.

Causes: The semantic search data store was not created in the 'gitlab-ai-framework-leg-prod' GCP project used by the AI Gateway fleet, leading to errors when the doc tool is used in Classic Duo Chat.

Response strategy: We reverted the code change that introduced the issue. After deploying the fix, Classic Duo Chat is working again with the doc tool. Error logs for the /v1/search/gitlab-docs endpoint have returned to normal and successful responses are confirmed in the UI.

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This ticket was created to track INC-6484, by incident.io 🔥