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GitLab topic filters are case-sensitive on project topics #1388
Description
Problem
GitLab connection topic filters normalize configured topics to lowercase, but compare them against project topics without normalizing the project side. A project topic like Backend does not match a config topic or glob such as backend.
Reproduction
Evaluate GitLab project filtering with include.topics: ["backend"] and a project whose API response includes topics: ["Backend"].
Expected
Topic include/exclude matching should be case-insensitive and symmetric between configured topics and project topics.
Actual
Configured topics are lowercased, while project topics retain their original case, so mixed-case GitLab topics can fail otherwise matching filters.
Impact
GitLab sync can unexpectedly include or exclude repositories when GitLab projects use mixed-case topics.
Activity
dubeyharshit0605 commentedon Jul 22, 2026
Hi @DivyamTalwar, thanks for the clear reproduction. I’d like to work on this if it’s available for an external contribution.
I’ll first reproduce the mismatch using a GitLab project topic such as Backend with a configured backend filter. Then I’ll add regression coverage for exact and glob-based include/exclude filters, normalize project topics at the same comparison boundary as configured topics, and verify that behavior for other providers remains unchanged.
Could a maintainer confirm that this is the intended direction?