Delete ML-based issue/PR labeler

[Youssef1313]

Once we are happy with the workflow added in #69008 and the agentic workflow for labeling issue, these old ML-based workflows can be deleted.

These workflows have been broken for a while already, it seems.

FYI @jeffhandley

[Copilot]

🔵 Needs a closer look

.github/labeler.README.md still documents these deleted workflows as active and should be updated/removed to avoid stale guidance.

Pull request overview

Removes legacy ML-based GitHub Actions workflows that used dotnet/issue-labeler for issue/PR area-label prediction, aligning the repo with the newer deterministic/agentic labeling approach referenced in the PR description.

Changes:

• Deleted the workflow that trained ML models for label prediction.
• Deleted the workflow that promoted staged models to the active slot.
• Deleted scheduled/dispatch workflows that predicted labels and retained cached models.

File summaries

File	Description
.github/workflows/labeler-train.yml	Removes the ML model training workflow.
.github/workflows/labeler-promote.yml	Removes the model promotion workflow.
.github/workflows/labeler-predict-pulls.yml	Removes the PR label prediction workflow (ML-based).
.github/workflows/labeler-predict-issues.yml	Removes the issue label prediction workflow (ML-based).
.github/workflows/labeler-cache-retention.yml	Removes the cache-retention workflow used to prevent model eviction.

Review details

Suppressed comments (1)

.github/workflows/labeler-predict-issues.yml:1

• This workflow is being removed, but the repo documentation at .github/labeler.README.md still describes the dotnet/issue-labeler workflows (including labeler-predict-issues.yml) as active. Please update or remove that README as part of this cleanup so it doesn’t mislead contributors.

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

---

💡 Add a code-review agent skill for context-aware, tailored reviews. Learn more in the docs.