Pipeline Pathologist — Graph-Native CI Failure Diagnosis | GitLab Transcend Hackathon

Pipeline Pathologist is a GitLab Duo ambient agent built for the GitLab Transcend Hackathon. When a pipeline fails, it reads the Orbit knowledge graph — not the logs — walks the call chain from the failing test to the changed code, and posts an evidence-chained diagnosis directly on the merge request: real culprit, flaky test, or environment issue. It clears innocent commits and abstains when there's no code-level cause. Tested live across five scenarios. Repo: (https://gitlab.com/gitlab-ai-hackathon/tra...)