2025-09-23: Merge Request home page is empty

Merge Request home page is empty (Severity 3 (Medium))

Problem: The Merge Request dashboard home page appeared blank for users on the canary environment.

Impact: Users on the canary environment saw a blank Merge Request dashboard page, preventing access to merge requests. Staging canary was not affected. The issue did not spread to production.

Causes: A failed artifact upload due to repeated '429 Too Many Requests' errors (caused by another incident https://app.incident.io/gitlab/incidents/4093) resulted in an empty assets hash file during the build process. This caused the asset cache to be incorrectly considered valid, so a gitlab image was built with old artifacts, and subsequently deployed to gprd-canary.

Response strategy: We redeployed to production canary to force asset regeneration, which resolved the issue. Deployments to production were temporarily blocked to prevent wider impact. A revert was prepared as a backup but was not needed.

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This ticket was created to track INC-4132, by incident.io 🔥