[ci-scan-feedback] Dedup ci-fix PRs by deterministic head-branch prefix

[github-actions]

Triggering signals

• PR [ci-fix] Needs review: select gen-debug-dump-docs Helix post-command shell by WindowsShell (refs #131382) #131981 closed as a duplicate of [ci-fix] Stop dump-doc collection on unsupported Helix targets (refs #131382) #131515 by a MEMBER (kotlarmilos, 2026-08-14): "Duplicate [ci-fix] Stop dump-doc collection on unsupported Helix targets (refs #131382) #131515". Both are help-wanted [ci-fix] PRs for the same KBE [ci-scan] Build break: Windows Helix work items fail on unexpanded $HELIX_PYTHONPATH in gen-debug-dump-docs post-command #131382, both carrying the same ci-fix/131382-... head branch and the same 2-line sendtohelixhelp.proj change. The fixer's Step 3 dedup (title/body #<kbe> phrase match) did not catch the already-open sibling, so a second help-wanted PR was opened — the exact "at most one open [ci-fix] PR per KBE" invariant (Hard rule 5) it is meant to protect.

Proposed edits

• .github/workflows/ci-failure-fix.md:164 — Step 3 preamble: build the <kbe> -> [PRs] map by parsing both each PR's head.ref branch and its Linked KBE: field, and state that every [ci-fix] PR must use a ci-fix/<kbe>-... head branch so the branch prefix is a deterministic, punctuation-free dedup key.
• .github/workflows/ci-failure-fix.md:166 — Step 3 check 1: match any enumerated [ci-fix] PR whose head.ref starts with ci-fix/<kbe>-, and make that prefix match authoritative (check it first, skip on a hit even when the search-tokenized title/body phrase match misses).
• .github/workflows/ci-failure-fix.md:251,261 — Branch FIX / Branch HELP emission steps: require the ci-fix/<kbe>-<slug>-<hash> head-branch name (numeric KBE id first) so the new dedup key is actually produced.

Expected behavior change

The next fixer run resolves dedup on the deterministic head-branch prefix rather than a #<kbe> phrase that GitHub's search tokenizer strips. A KBE that already has an open [ci-fix] PR will be recognized regardless of title wording, so the fixer will not open a second help-wanted PR for it — preventing the #131981/#131515 duplicate class.

Note

AI/Copilot-generated PR from the ci-scan-feedback workflow.

Generated by CI Outer-Loop Failure Scanner — Feedback · opus48 · 376 AIC · ⌖ 25.5 AIC · ⊞ 20.5K · ◷

---

Note

This was originally intended as a pull request, but the git push operation failed.

Original error: The process '/usr/bin/git' failed with exit code 1

Workflow Run: View run details and download bundle artifact

The bundle file is available in the agent artifact in the workflow run linked above.

To create a pull request with the changes:

# Download the artifact from the workflow run
gh run download 32256627826 -n agent -D /tmp/agent-32256627826

# Fetch the bundle into a temporary ref, then update the local branch
git fetch /tmp/agent-32256627826/aw-ci-scan-feedback-2026-08-19.bundle refs/heads/ci-scan-feedback-2026-08-19:refs/bundles/create-pr-ci-scan-feedback-2026-08-19-bd6d765b99342799-62d48ed1
git update-ref refs/heads/ci-scan-feedback-2026-08-19-bd6d765b99342799 refs/bundles/create-pr-ci-scan-feedback-2026-08-19-bd6d765b99342799-62d48ed1
git checkout ci-scan-feedback-2026-08-19-bd6d765b99342799
# Ensure the working tree matches the updated branch
git reset --hard
# Remove the temporary bundle ref
git update-ref -d refs/bundles/create-pr-ci-scan-feedback-2026-08-19-bd6d765b99342799-62d48ed1

# Push the branch to origin
git push origin ci-scan-feedback-2026-08-19-bd6d765b99342799

# Create the pull request
gh pr create --title '[ci-scan-feedback] Dedup ci-fix PRs by deterministic head-branch prefix' --base main --head ci-scan-feedback-2026-08-19-bd6d765b99342799 --repo dotnet/runtime

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.