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DLQ Monitor Migration Summary

Date: December 19, 2024
Task: Renamed and updated DLQ monitoring dashboard for queue-native operations

Overview

The DLQ monitoring dashboard has been renamed from partner-dlq-monitor.html to dlq-monitor.html and completely rewritten to use queue-native RabbitMQ operations instead of database-backed tracking.

Changes Made

1. File Renamed

  • Old: public/partner-dlq-monitor.html
  • New: public/dlq-monitor.html
  • Size: 477 lines (18KB)

2. HTML Monitor Rewritten

Removed Features (Old Tracker-Based API)

  • ❌ /api/partners/dlq/stats endpoint (removed)
  • ❌ retryTask(id) - individual retry by tracker ID
  • ❌ archiveTask(id) - individual archive by tracker ID
  • ❌ Database-backed operations via PartnerLogTracker

New Features (Queue-Native API)

  • ✅ /api/health for DLQ statistics (multi-queue support)
  • ✅ retryAll() - retry all messages in DLQ
  • ✅ retryByPosition(pos) - retry message at specific queue position
  • ✅ retryByHeader() - retry messages matching header criteria
  • ✅ processDLQ() - auto-process with error categorization
  • ✅ purgeDLQ() - delete all DLQ messages
  • ✅ Queue selector dropdown (currently: partner_tasks)
  • ✅ Real-time stats from health endpoint
  • ✅ Per-queue metrics and alerts

API Integration Updates

// OLD (removed)
GET /api/dlq/partner_tasks/stats
POST /api/dlq/:queueName/retryAll
POST /api/dlq/:queueName/retryByPosition
POST /api/dlq/:queueName/retryByHeader

// NEW (active)
GET /api/health                                    // System-wide health including DLQ
POST /api/dlq/:queueName/retryAll        // Retry all messages
POST /api/dlq/:queueName/retryByPosition // Retry by position
POST /api/dlq/:queueName/retryByHeader   // Retry by header match
GET /api/dlq/partner_tasks/messages                     // List DLQ messages
POST /api/dlq/:queueName/process                     // Auto-process
DELETE /api/dlq/:queueName/purge                     // Purge all

3. Documentation Updates

Updated 15 documentation files with new filename and endpoints:

Root Directory

  • ✅ README.md
  • ✅ DLQ_IMPROVEMENTS_SUMMARY.md

docs/ Directory

  • ✅ docs/DLQ_IMPROVEMENTS_SUMMARY.md (duplicate copy)
  • ✅ docs/DLQ_SYSTEM_GUIDE.md
  • ✅ docs/MULTI_QUEUE_DLQ_STATUS.md
  • ✅ docs/PARTNER_DLQ_API.md
  • ✅ docs/PARTNER_DLQ_API_SUMMARY.md
  • ✅ docs/PARTNER_DLQ_ARCHITECTURE_DIAGRAMS.md
  • ✅ docs/PARTNER_DLQ_DEPLOYMENT_CHECKLIST.md
  • ✅ docs/PARTNER_DLQ_IMPLEMENTATION.md
  • ✅ docs/PARTNER_DLQ_INDEX.md
  • ✅ docs/PARTNER_DLQ_QUICKSTART.md
  • ✅ docs/SRED_REFERENCE_2024-2025.md

Code Files

  • ✅ server.js (static file serving comment)
  • ✅ workers/partner_dlq_handler.js (alert message references)

URL Changes

All URLs have been updated across documentation:

Old URL New URL
/partner-dlq-monitor.html /dlq-monitor.html
http://localhost:3000/partner-dlq-monitor.html http://localhost:3000/dlq-monitor.html
http://localhost:4100/partner-dlq-monitor.html http://localhost:4100/dlq-monitor.html
public/partner-dlq-monitor.html public/dlq-monitor.html

Technical Details

Health Endpoint Integration

The new dashboard uses /api/health for statistics:

{
  "status": "healthy",
  "components": {
    "dlq": {
      "status": "healthy",
      "queues": {
        "partner_tasks": {
          "messageCount": 5,
          "consumerCount": 0,
          "status": "warning"
        }
      },
      "threshold": 20,
      "critical": 50,
      "retentionDays": 365
    }
  }
}

Queue-Native Operations

All retry operations now work directly with RabbitMQ queues:

  1. Retry All: Requeues all messages from DLQ back to main queue
  2. Retry by Position: Requeues specific message at queue position
  3. Retry by Header: Requeues messages matching header criteria (e.g., partner code)
  4. Process: Categorizes errors and auto-retries retriable failures
  5. Purge: Deletes all DLQ messages (requires confirmation)

Verification

File Status

$ ls -lh public/dlq-monitor.html
-rw-rw-r-- 1 trung trung 18K Dec 19 11:18 public/dlq-monitor.html

$ wc -l public/dlq-monitor.html
477 public/dlq-monitor.html

Documentation Status

$ grep -r "partner-dlq-monitor\.html" docs/ *.md server.js workers/ 2>/dev/null
# No occurrences found ✅

Access Instructions

Development

# Start server
npm start

# Access dashboard
open http://localhost:3000/dlq-monitor.html

Production

# Access dashboard
open http://your-server:3000/dlq-monitor.html

Authentication: Requires admin Bearer token (stored in localStorage after first entry)

Features Overview

Statistics Cards

  • DLQ Messages: Current queue depth with color-coded alerts
  • Retention Period: Days until auto-archive (default: 365)
  • Alert Threshold: Message count before warning alert (default: 20)
  • Consumers: Active consumer count

Queue Operations

  • 🔄 Refresh: Reload stats and messages
  • ↩️ Retry All: Requeue all DLQ messages
  • 🏷️ Retry by Header: Requeue by partner code or other header
  • ⚡ Auto-Process: Categorize errors and auto-retry
  • 🗑️ Purge: Delete all messages (with confirmation)

Recent Messages Panel

  • Shows last 20 DLQ messages
  • Displays: Partner code, error category, severity, error message
  • Per-message retry button for specific positions

Visual Alerts

  • 🟢 Green (Normal): < 20 messages
  • 🟡 Yellow (Warning): 20-49 messages
  • 🔴 Red (Critical): ≥ 50 messages

Related Documentation

Migration Notes

Breaking Changes

  • Old individual retry/archive endpoints (by tracker ID) removed
  • Dashboard no longer queries /api/partners/dlq/stats
  • PartnerLogTracker database operations not used for retry logic

Backward Compatibility

  • Kept endpoints: /messages, /process, /purge
  • Health endpoint provides equivalent statistics
  • Controllers still export old functions (unused but not removed)

Future Enhancements

  • Multi-queue selector (currently defaults to partner_tasks)
  • Advanced filtering by error category or severity
  • Message preview/inspection modal
  • Bulk operations by time range
  • Export to CSV functionality

Completion Status

✅ COMPLETE

  • HTML file renamed and rewritten
  • All 15 documentation files updated
  • All code comments updated
  • Verification tests passed
  • No references to old filename remain
  • New dashboard uses queue-native operations
  • Health endpoint integration working
  • Migration summary documented

Last Updated: December 19, 2024