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Queue Health Metrics & Schema Implementation

Branch

feature/queue-health-metrics-and-schema

Tasks Completed

1. Return Queue Health Metrics ✅

File: src/health/health.controller.ts

  • Added GET /health/queues endpoint
  • Returns QueueHealthResponseDto with:
    • Overall system health status (healthy/degraded/unhealthy)
    • Per-queue health metrics including job counts and failure rates
    • System-wide failure rate
    • Timestamp of health check

File: src/queue/queue-health.service.ts

  • getQueueHealth() method calculates health for all queues
  • Determines health status based on:
    • Failure rate > 20% → unhealthy
    • Failure rate > 10% → degraded
    • Otherwise → healthy
  • Tracks job counts: waiting, active, completed, failed, delayed, prioritized
  • Calculates average retry count and failure rate per queue

2 & 3. Define API Response Schemas for Queue Statistics ✅

File: src/queue/dtos/queue-stats.dto.ts

Created comprehensive DTOs with full Swagger documentation:

QueueJobCountDto

  • Fields: waiting, active, completed, failed, delayed, prioritized
  • Usage: Represents job counts in each state

QueueHealthDto

  • Fields: queue name, status, jobs, totalJobs, failureRate, avgRetryCount, timestamp
  • Usage: Individual queue health snapshot

QueueHealthResponseDto

  • Fields: status, queues[], totalJobsAcrossQueues, systemWideFailureRate, timestamp
  • Usage: Response for /health/queues endpoint

QueueStatisticsDto

  • Fields: queue, jobCounts, totalProcessed, successCount, failureCount, failureRate, avgProcessingTimeSeconds, avgRetryCount, failureReasonCounts, timestamp
  • Usage: Detailed statistics for a single queue

QueueStatisticsResponseDto

  • Fields: queues[], timestamp
  • Usage: Response for /health/queues/statistics endpoint

4. Centralize Retry and Backoff Configuration ✅

File: src/queue/retry-backoff-config.service.ts

Provides centralized management of retry and backoff strategies:

Key Features:

  • Per-Queue Configuration: Each queue has its own default retry settings
  • Environment Variable Overrides: RETRY_BACKOFF_{QUEUE}_ATTEMPTS, RETRY_BACKOFF_{QUEUE}_DELAY_MS, RETRY_BACKOFF_{QUEUE}_MULTIPLIER
  • Default Configurations:
    • clip-generation: 5 attempts, 2000ms exponential backoff
    • nft-mint: 3 attempts, 1000ms exponential backoff
    • clip-posting: 4 attempts, 1500ms exponential backoff
    • email-delivery: 3 attempts, 1000ms exponential backoff
    • anomaly-detection: 3 attempts, 2000ms exponential backoff

Public Methods:

  • getRetryConfig(queueName) - Get config for specific queue
  • getBullMQRetryConfig(queueName) - Get BullMQ-compatible format
  • getAllRetryConfigs() - Get all queue configurations
  • getMaxTotalJobTimeMs(queueName) - Calculate max retry duration
  • getRetryInfo(queueName) - Get detailed retry information with breakdown per attempt

New API Endpoints

GET /health/queues

Returns health metrics for all BullMQ queues

  • Response: QueueHealthResponseDto
  • Status Codes:
    • 200: All queues healthy
    • 503: One or more queues unhealthy
  • Example Response:
{
  "status": "healthy",
  "queues": [
    {
      "queue": "clip-generation",
      "status": "healthy",
      "jobs": {
        "waiting": 10,
        "active": 2,
        "completed": 150,
        "failed": 5,
        "delayed": 3,
        "prioritized": 1
      },
      "totalJobs": 171,
      "failureRate": 3.2,
      "avgRetryCount": 1.2,
      "timestamp": "2026-06-27T10:30:45.123Z"
    }
  ],
  "totalJobsAcrossQueues": 500,
  "systemWideFailureRate": 2.8,
  "timestamp": "2026-06-27T10:30:45.123Z"
}

GET /health/queues/statistics

Returns detailed statistics for all queues

  • Response: QueueStatisticsResponseDto
  • Status Code: 200
  • Includes:
    • Job counts by state
    • Success/failure counts
    • Average processing time in seconds
    • Failure reasons breakdown
    • Failure rate percentage

Module Updates

src/health/health.module.ts

  • Added imports: QueueModule
  • Added providers: QueueHealthService, RetryBackoffConfigService
  • Added exports: QueueHealthService, RetryBackoffConfigService

src/queue/queue.module.ts

  • Added providers: RetryBackoffConfigService, QueueHealthService
  • Added exports: RetryBackoffConfigService, QueueHealthService

Integration Points

Health Controller

  • Injects QueueHealthService
  • New endpoints leverage existing Swagger documentation patterns
  • Error handling with appropriate HTTP status codes

Existing Services

  • No breaking changes to existing queue services
  • RetryBackoffConfigService can be injected into any service needing retry configuration
  • QueueHealthService monitors all registered queues

Environment Variables

Retry/Backoff Configuration

RETRY_BACKOFF_CLIP_GENERATION_ATTEMPTS=5
RETRY_BACKOFF_CLIP_GENERATION_DELAY_MS=2000
RETRY_BACKOFF_CLIP_GENERATION_MULTIPLIER=2

RETRY_BACKOFF_NFT_MINT_ATTEMPTS=3
RETRY_BACKOFF_NFT_MINT_DELAY_MS=1000
RETRY_BACKOFF_NFT_MINT_MULTIPLIER=2

# ... and so on for other queues

Files Created

  1. src/queue/dtos/queue-stats.dto.ts - API response schemas
  2. src/queue/retry-backoff-config.service.ts - Centralized retry configuration
  3. src/queue/queue-health.service.ts - Queue health metrics service

Files Modified

  1. src/health/health.controller.ts - Added two new endpoints
  2. src/health/health.module.ts - Updated module imports/exports/providers
  3. src/queue/queue.module.ts - Updated module providers/exports

Next Steps

  1. Run npm run build to compile and verify no TypeScript errors
  2. Run npm run test to ensure no regressions
  3. Test the new endpoints:
    • curl http://localhost:3000/health/queues
    • curl http://localhost:3000/health/queues/statistics
  4. Verify Swagger documentation updated automatically
  5. Commit and push to create PR

Key Design Decisions

  1. Service Separation: Health metrics in separate service for maintainability
  2. Centralized Configuration: All retry logic in one place for consistency
  3. Environment Variable Support: Allows ops teams to tune without code changes
  4. Graceful Degradation: Health checks handle unavailable queues gracefully
  5. Comprehensive DTOs: All Swagger documentation included for API clarity