feat(infra): add PR labeler configurations and workflows (#33031)

Author: mdrxy

.github/labeler.yml

@@ -0,0 +1,80 @@
+# GitHub PR Labeler Configuration for LangChain
+# Automatically applies labels based on changed files and branch patterns
+
+# Core packages
+core:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/core/**/*"
+
+langchain:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/langchain/**/*"
+          - "libs/langchain_v1/**/*"
+
+v1:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/langchain_v1/**/*"
+
+cli:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/cli/**/*"
+
+standard-tests:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/standard-tests/**/*"
+
+# Partner integrations
+integration:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "libs/partners/**/*"
+
+# Infrastructure and DevOps
+infra:
+  - changed-files:
+      - any-glob-to-any-file:
+          - ".github/**/*"
+          - "Makefile"
+          - ".pre-commit-config.yaml"
+          - "scripts/**/*"
+          - "docker/**/*"
+          - "Dockerfile*"
+
+github_actions:
+  - changed-files:
+      - any-glob-to-any-file:
+          - ".github/workflows/**/*"
+          - ".github/actions/**/*"
+
+dependencies:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/pyproject.toml"
+          - "uv.lock"
+          - "**/requirements*.txt"
+          - "**/poetry.lock"
+
+# Documentation
+documentation:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "docs/**/*"
+          - "**/*.md"
+          - "**/*.rst"
+          - "**/README*"
+
+# Security related changes
+security:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*security*"
+          - "**/*auth*"
+          - "**/*credential*"
+          - "**/*secret*"
+          - "**/*token*"
+          - ".github/workflows/security*"

.github/pr-title-labeler.yml

@@ -0,0 +1,27 @@
+# PR Title Labeler Configuration
+# Labels PRs based on conventional commit patterns in titles
+# Format: type(scope): description or type!: description (breaking)
+
+add-missing-labels: true
+include-commits: false
+include-title: true
+label-for-breaking-changes: breaking
+
+label-mapping:
+  # Features and enhancements
+  feature: ["feat"]
+
+  # Bug fixes
+  fix: ["fix"]
+
+  # Documentation
+  documentation: ["docs"]
+
+  # Infrastructure and tooling
+  infra: ["chore", "ci", "build", "infra"]
+
+  # Integration partners - detected by scope
+  integration: ["anthropic", "chroma", "deepseek", "exa", "fireworks", "groq", "huggingface", "mistralai", "nomic", "ollama", "openai", "perplexity", "prompty", "qdrant", "xai"]
+
+  # Releases
+  release: ["release"]

.github/workflows/check_diffs.yml

@@ -111,6 +111,7 @@ jobs:
 
   # Verify integration tests compile without actually running them (faster feedback)
   compile-integration-tests:
+    name: 'Compile Integration Tests'
     needs: [ build ]
     if: ${{ needs.build.outputs.compile-integration-tests != '[]' }}
     strategy:

.github/workflows/labeler.yml

@@ -0,0 +1,22 @@
+name: "🏷️ Pull Request Labeler"
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  labeler:
+    name: 'label'
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Label Pull Request
+      uses: actions/labeler@v6
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        configuration-path: .github/labeler.yml
+        sync-labels: true

.github/workflows/pr_lint.yml

@@ -26,7 +26,7 @@
 #   • release    — prepare a new release
 #
 # Allowed Scopes (optional):
-#   core, cli, langchain, langchain_v1, langchain_legacy, standard-tests, 
+#   core, cli, langchain, langchain_v1, langchain_legacy, standard-tests,
 #   text-splitters, docs, anthropic, chroma, deepseek, exa, fireworks, groq,
 #   huggingface, mistralai, nomic, ollama, openai, perplexity, prompty, qdrant,
 #   xai, infra
@@ -59,7 +59,7 @@ on:
 jobs:
   # Validates that PR title follows Conventional Commits specification
   lint-pr-title:
-    name: 'Validate PR Title Format'
+    name: 'validate format'
     runs-on: ubuntu-latest
     steps:
       - name: '✅ Validate Conventional Commits Format'

.github/workflows/pr_title_labeler.yml

@@ -0,0 +1,21 @@
+name: "🏷️ PR Title Labeler"
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited]
+
+jobs:
+  pr-title-labeler:
+    name: 'label'
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Label PR based on title
+      uses: grafana/[email protected]
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        configuration-path: .github/pr-title-labeler.yml