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+# PyTorch Bot Architecture Analysis
+
+## Overview
+
+The PyTorch bot is a GitHub webhook automation system built with **Probot** that manages CI/CD workflows, code reviews, and development operations for the PyTorch ecosystem. It's deployed as a Next.js application on Vercel and integrates with multiple external services.
+
+## Core Architecture
+
+### Entry Points
+
+- **Main Entry**: `lib/bot/index.ts:17` - Registers all bot modules with Probot
+- **Command Handler**: `lib/bot/pytorchBot.ts:6` - Handles `@pytorchbot` commands via comments and reviews
+- **Command Parser**: `lib/bot/cliParser.ts:15` - Parses bot commands using argparse-style CLI interface
+
+### Command System
+
+The bot supports these primary commands:
+
+- **`merge`** - Merges PRs with approval validation and force-merge capabilities
+- **`revert`** - Reverts merged PRs with classification tracking
+- **`rebase`** - Rebases PRs onto target branches
+- **`label`** - Adds labels with permission validation
+- **`cherry-pick`** - Cherry-picks PRs to release branches
+- **`drci`** - Updates Dr. CI status comments
+
+### Permission System (`lib/bot/utils.ts:248`)
+
+- **Write Permissions**: Admin/write collaborators can use force-merge, ignore-current flags
+- **Rebase Permissions**: Write permissions OR non-first-time contributors
+- **Workflow Permissions**: Write permissions OR users with approved pull runs
+- **Authorization Tracking**: Uses GitHub's collaborator permission API
+
+## Bot Modules
+
+### Core Command Bots
+
+1. **pytorchBotHandler** (`lib/bot/pytorchBotHandler.ts:41`) - Central command processor
+2. **cliParser** (`lib/bot/cliParser.ts:7`) - Command-line interface parser
+
+### Automation Bots
+
+3. **autoLabelBot** - Smart labeling based on file changes and patterns
+4. **autoCcBot** - Auto-CC users based on label subscriptions
+5. **retryBot** - Intelligent CI retry using flakiness analytics
+6. **ciflowPushTrigger** - Git tag management for CI flow triggers
+7. **cancelWorkflowsOnCloseBot** - Resource cleanup on PR closure
+
+### CI Integration Bots
+
+8. **triggerCircleCIWorkflows** - CircleCI pipeline integration
+9. **triggerInductorTestsBot** - PyTorch Inductor test triggering
+10. **verifyDisableTestIssueBot** - Test disabling authorization
+
+### Security & Review Bots
+
+11. **stripApprovalBot** - Removes approvals on PR reopen
+12. **codevNoWritePermBot** - Notifies about permission requirements
+13. **drciBot** - Dr. CI dashboard integration
+
+### Infrastructure Bots
+
+14. **webhookToDynamo** - Event logging to DynamoDB
+15. **pytorchbotLogger** - Bot action logging
+
+## Detailed Bot Analysis
+
+### 1. autoLabelBot.ts
+
+**Primary Purpose:** Automatically assigns labels to pull requests and issues based on various criteria including file paths, titles, and patterns.
+
+**Key Features:**
+
+- **Title-based labeling**: Matches PR/issue titles against regex patterns to assign relevant labels
+- **File-based labeling**: Analyzes changed files to assign module-specific and release note labels
+- **Repository-specific rules**: Applies custom labeling rules based on the repository
+- **CIFlow integration**: Assigns ciflow/\* labels based on changed files (e.g., MPS, H100 symmetry memory tests)
+- **Release notes categorization**: Automatically categorizes PRs for release notes (PyTorch-specific)
+- **Permission filtering**: Only applies CI flow labels if the author has appropriate permissions
+
+**GitHub Webhooks:**
+
+- `issues.labeled`, `issues.opened`, `issues.edited`
+- `pull_request.opened`, `pull_request.edited`, `pull_request.synchronize`
+
+**Special Logic:** Filters CI flow labels based on user permissions and workflow approval status
+
+### 2. autoCcBot.ts
+
+**Primary Purpose:** Automatically CC (carbon copy) relevant users when specific labels are applied to issues or PRs.
+
+**Key Features:**
+
+- **Subscription management**: Loads user subscriptions from a tracking issue
+- **Dynamic CC lists**: Updates CC lists in issue/PR descriptions based on applied labels
+- **Self-removal**: Prevents users from being CC'd on their own issues/PRs
+- **Incremental updates**: Only adds new CCs, preserving existing ones
+
+**GitHub Webhooks:**
+
+- `issues.labeled`
+- `pull_request.labeled`
+
+**Special Logic:** Parses subscription data from a configured tracking issue and maintains CC lists without duplicating existing mentions
+
+### 3. retryBot.ts
+
+**Primary Purpose:** Intelligently retries failed CI workflows and jobs based on failure patterns and flakiness analysis.
+
+**Key Features:**
+
+- **Smart retry logic**: Distinguishes between infrastructure failures and code-related failures
+- **Flaky job detection**: Queries ClickHouse for flaky job data from previous workflows
+- **Configurable workflows**: Only retries workflows specified in configuration
+- **Failure threshold**: Limits retries when too many jobs fail (>5 jobs)
+- **Branch-specific behavior**: Different retry logic for main branch vs. feature branches
+- **Always-retry jobs**: Specific jobs that are retried regardless of failure type
+
+**GitHub Webhooks:**
+
+- `workflow_run.completed`
+
+**Special Logic:** Uses ML/analytics data from ClickHouse to make intelligent retry decisions
+
+### 4. ciflowPushTrigger.ts
+
+**Primary Purpose:** Manages Git tags that trigger CI workflows based on CI flow labels applied to PRs.
+
+**Key Features:**
+
+- **Tag synchronization**: Creates/updates Git tags when CI flow labels are added
+- **Permission validation**: Ensures only authorized users can trigger CI flows
+- **Tag cleanup**: Removes tags when labels are removed or PRs are closed
+- **Configuration validation**: Validates labels against configured allowed CI flow tags
+- **Permission-based filtering**: Removes CI flow labels from unauthorized PRs
+
+**GitHub Webhooks:**
+
+- `pull_request.labeled`, `pull_request.unlabeled`
+- `pull_request.synchronize`, `pull_request.opened`, `pull_request.reopened`, `pull_request.closed`
+
+**Special Logic:** Creates tags in format `ciflow/label/PR_NUMBER` to trigger downstream CI systems
+
+### 5. triggerCircleCIWorkflows.ts
+
+**Primary Purpose:** Integrates with CircleCI by triggering workflows based on GitHub events and labels.
+
+**Key Features:**
+
+- **Label-to-parameter mapping**: Converts GitHub labels to CircleCI pipeline parameters
+- **Branch/tag filtering**: Different behavior for push events vs. pull requests
+- **Configuration-driven**: Uses YAML config to define label-to-parameter mappings
+- **Fork handling**: Special handling for PRs from forked repositories
+- **Default parameters**: Supports default parameter values for workflows
+
+**GitHub Webhooks:**
+
+- `pull_request.labeled`, `pull_request.synchronize`
+- `push`
+
+**Special Logic:** Translates GitHub repository state into CircleCI pipeline parameters using configurable mappings
+
+### 6. triggerInductorTestsBot.ts
+
+**Primary Purpose:** Allows authorized users to trigger PyTorch Inductor tests via comment commands.
+
+**Key Features:**
+
+- **Comment-based triggering**: Responds to `@pytorch run pytorch tests` comments
+- **User authorization**: Restricts access to pre-approved users and repositories
+- **Cross-repository workflow**: Triggers workflows in pytorch/pytorch-integration-testing
+- **Commit handling**: Uses appropriate commit SHAs for different repositories
+- **Error handling**: Provides feedback on success/failure of test triggering
+
+**GitHub Webhooks:**
+
+- `issue_comment.created`
+
+**Special Logic:** Security-focused with explicit allowlists for users and repositories
+
+### 7. cancelWorkflowsOnCloseBot.ts
+
+**Primary Purpose:** Cancels running GitHub Actions workflows when PRs are closed to save compute resources.
+
+**Key Features:**
+
+- **Automatic cancellation**: Cancels all running workflows associated with a PR's head SHA
+- **Bot exclusions**: Doesn't cancel workflows for bot users (pytorchbot, pytorchmergebot)
+- **Repository filtering**: Only operates on pytorch/pytorch repository
+- **Merge detection**: Skips cancellation for PRs that were actually merged
+- **Batch processing**: Cancels multiple workflows concurrently
+
+**GitHub Webhooks:**
+
+- `pull_request.closed`
+
+**Special Logic:** Prevents unnecessary resource usage by canceling workflows for closed/abandoned PRs
+
+### 8. verifyDisableTestIssueBot.ts
+
+**Primary Purpose:** Validates and processes issues that request disabling or marking tests as unstable.
+
+**Key Features:**
+
+- **Title parsing**: Recognizes DISABLED and UNSTABLE prefixes in issue titles
+- **Authorization validation**: Checks if users have permission to disable tests
+- **Validation comments**: Posts detailed validation information about the disable request
+- **Auto-closure**: Automatically closes unauthorized disable requests
+- **Multi-format support**: Handles single test disables and aggregate disable issues
+
+**GitHub Webhooks:**
+
+- `issues.opened`, `issues.edited`
+
+**Special Logic:** Critical security component that ensures only authorized users can disable CI tests
+
+### 9. stripApprovalBot.ts
+
+**Primary Purpose:** Removes PR approvals when PRs are reopened to ensure fresh review.
+
+**Key Features:**
+
+- **Approval dismissal**: Automatically dismisses all existing approvals on PR reopening
+- **Permission-based**: Only acts on PRs from users without write permissions
+- **Notification messages**: Provides clear explanation for why approvals were removed
+- **Security-focused**: Ensures that reopened PRs (potentially after reverts) get fresh review
+
+**GitHub Webhooks:**
+
+- `pull_request.reopened`
+
+**Special Logic:** Maintains code review integrity by requiring fresh approvals after PR reopening
+
+### 10. codevNoWritePermBot.ts
+
+**Primary Purpose:** Notifies Phabricator/Codev users when they need GitHub write permissions for CI.
+
+**Key Features:**
+
+- **Differential detection**: Recognizes PRs exported from Phabricator (Differential Revision markers)
+- **Permission checking**: Verifies if the author has write permissions
+- **Helpful messaging**: Provides links to internal documentation for getting permissions
+- **Repository filtering**: Only operates on pytorch/pytorch repository
+
+**GitHub Webhooks:**
+
+- `pull_request.opened`
+
+**Special Logic:** Bridges the gap between internal Facebook/Meta development workflow and external GitHub CI requirements
+
+### 11. drciBot.ts
+
+**Primary Purpose:** Manages Dr. CI (Diagnostic CI) comments that provide comprehensive PR status information.
+
+**Key Features:**
+
+- **Status aggregation**: Creates/updates comprehensive status comments on PRs
+- **Integration with DrCI utilities**: Leverages external DrCI infrastructure
+- **PR state tracking**: Only operates on open PRs
+- **URL integration**: Links to external Dr. CI dashboard
+
+**GitHub Webhooks:**
+
+- `pull_request.opened`, `pull_request.synchronize`
+
+**Special Logic:** Serves as the interface between GitHub PRs and the comprehensive Dr. CI dashboard system
+
+### 12. webhookToDynamo.ts
+
+**Primary Purpose:** Logs GitHub webhook events to DynamoDB tables for analytics and auditing.
+
+**Key Features:**
+
+- **Comprehensive logging**: Captures workflow runs, jobs, issues, PRs, comments, and reviews
+- **Structured storage**: Organizes data into specific DynamoDB tables by event type
+- **Key prefixing**: Prevents conflicts by prefixing keys with repository information
+- **Label tracking**: Special handling for label events with timestamp tracking
+- **UUID generation**: Uses UUIDs for events that don't have natural unique identifiers
+
+**GitHub Webhooks:**
+
+- `workflow_job`, `workflow_run`, `issues`, `issue_comment`
+- `pull_request`, `pull_request_review`, `pull_request_review_comment`, `push`
+
+**Special Logic:** Forms the foundation of the analytics and monitoring infrastructure by persisting all relevant GitHub events
+
+## External Integrations
+
+### Data Storage
+
+- **DynamoDB**: Event logging, bot action tracking (`lib/bot/pytorchbotLogger.ts:4`)
+- **ClickHouse**: CI analytics, flaky test data queries (`lib/bot/pytorchBotHandler.ts:5`)
+
+### CI Systems
+
+- **GitHub Actions**: Workflow triggering via repository dispatch events
+- **CircleCI**: Parameter-based workflow triggering
+- **Dr. CI**: Comprehensive status dashboard integration
+
+### Configuration Management
+
+- **Repository Configs**: `.github/pytorch-probot.yml` files (`lib/bot/utils.ts:64`)
+- **Cached Config Tracker**: Performance optimization for config loading (`lib/bot/utils.ts:46`)
+- **Label Subscriptions**: Issue-based user subscription management
+
+## Key Features
+
+### Intelligent Merge System
+
+- **Approval Validation**: Reviews from COLLABORATOR+ required for PyTorch repos
+- **Force Merge**: Admin-only with audit trail and reason requirement
+- **CI Flow Labels**: Automatic trunk/pull label management
+- **Branch Targeting**: Supports viable/strict and main branch merging
+
+### Smart Retry Logic (`retryBot.ts`)
+
+- **Flakiness Analysis**: Queries historical data to identify infrastructure failures
+- **Selective Retrying**: Only retries jobs likely to succeed on retry
+- **Branch-specific Rules**: Different behavior for main vs. feature branches
+
+### Permission-based Security
+
+- **Multi-tier Authorization**: Different permission levels for different actions
+- **First-time Contributor Handling**: Restricted permissions for new contributors
+- **Audit Logging**: All bot actions logged to DynamoDB
+
+### Auto-labeling Intelligence
+
+- **File Pattern Matching**: Assigns module labels based on changed files
+- **CI Flow Detection**: Automatic ciflow/\* label assignment
+- **Release Note Categorization**: Automated release note classification
+
+## Data Flow
+
+1. **GitHub Webhook** → **Probot App** → **Bot Module Router**
+2. **Command Parsing** → **Permission Validation** → **Action Execution**
+3. **External API Calls** (GitHub, CircleCI, ClickHouse)
+4. **Event Logging** (DynamoDB) + **Response** (GitHub reactions/comments)
+
+## Integration Architecture
+
+These bots work together as a cohesive CI/CD and development workflow system:
+
+- **Permission System**: Multiple bots check `hasWritePermissions` and `hasApprovedPullRuns` for security
+- **Configuration Management**: Many bots use `CachedConfigTracker` for repository-specific settings
+- **Event Coordination**: Bots respond to related events (e.g., label changes trigger multiple bots)
+- **Data Analytics**: Several bots feed data to ClickHouse and DynamoDB for decision-making
+- **External Integrations**: Connect GitHub to CircleCI, Dr. CI dashboard, and internal Meta systems
+
+## Deployment Context
+
+- **Platform**: Vercel (Next.js)
+- **Framework**: Probot (GitHub Apps framework)
+- **Language**: TypeScript with modern ES modules
+- **Monitoring**: DynamoDB logging + external Dr. CI dashboard
+
+## Configuration Files
+
+- `Constants.ts:1` - Cherry-pick and revert classifications
+- `subscriptions.ts:1` - Label subscription parsing utilities
+- Repository-specific configs loaded via `CachedConfigTracker`
+
+This bot ecosystem provides comprehensive automation for the PyTorch development workflow, balancing developer productivity with security and code quality requirements through intelligent automation and robust permission systems.