Files

kappa c0e47482c4 feat(phase-5-3): 모니터링 강화

logger.ts, metrics.ts, /api/metrics 추가
Version: e3bcb4ae

2026-01-19 16:43:36 +09:00

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Metrics API Example Response

Endpoint: GET /api/metrics

Authentication: Bearer Token (WEBHOOK_SECRET)

Example Request:

curl -X GET https://telegram-summary-bot.kappa-d8e.workers.dev/api/metrics \
  -H "Authorization: Bearer your-webhook-secret"

Response Format

Successful Response (200 OK)

{
  "timestamp": "2026-01-19T07:35:42.123Z",
  "circuitBreakers": {
    "openai": {
      "state": "CLOSED",
      "failures": 0,
      "lastFailureTime": null,
      "stats": {
        "totalRequests": 1250,
        "totalFailures": 5,
        "totalSuccesses": 1245
      },
      "config": {
        "failureThreshold": 3,
        "resetTimeoutMs": 30000,
        "monitoringWindowMs": 60000
      }
    }
  },
  "metrics": {
    "api_calls": {
      "openai": {
        "count": 1250,
        "avg_duration": 0
      }
    },
    "errors": {
      "retry_exhausted": 0,
      "circuit_breaker_open": 0
    },
    "cache": {
      "hit_rate": 0
    }
  }
}

Circuit States

State	Description	Behavior
`CLOSED`	Normal operation	All requests pass through
`HALF_OPEN`	Testing recovery	Single test request allowed
`OPEN`	Service unavailable	All requests blocked immediately

When Circuit is OPEN

{
  "timestamp": "2026-01-19T07:40:15.456Z",
  "circuitBreakers": {
    "openai": {
      "state": "OPEN",
      "failures": 3,
      "lastFailureTime": "2026-01-19T07:40:10.123Z",
      "stats": {
        "totalRequests": 1253,
        "totalFailures": 8,
        "totalSuccesses": 1245
      },
      "config": {
        "failureThreshold": 3,
        "resetTimeoutMs": 30000,
        "monitoringWindowMs": 60000
      }
    }
  },
  "metrics": {
    "api_calls": {
      "openai": {
        "count": 1253,
        "avg_duration": 0
      }
    },
    "errors": {
      "retry_exhausted": 0,
      "circuit_breaker_open": 1
    },
    "cache": {
      "hit_rate": 0
    }
  }
}

Error Responses

401 Unauthorized:

{
  "error": "Unauthorized"
}

500 Internal Server Error:

{
  "error": "Error message here"
}

Use Cases

Monitoring Dashboard

Poll this endpoint periodically to track Circuit Breaker health
Alert when state changes to OPEN
Track failure rate trends

Debugging

Check Circuit Breaker state during production issues
Verify if service degradation is due to circuit being open
Review recent failure counts

Performance Analysis

Monitor total requests and success rate
Identify patterns in failure occurrences
Validate circuit breaker thresholds

Future Enhancements

The metrics section is designed to be extensible:

// Planned additions:
metrics: {
  api_calls: {
    openai: { count: number; avg_duration: number },
    namecheap: { count: number; avg_duration: number },
    brave: { count: number; avg_duration: number }
  },
  errors: {
    retry_exhausted: number,
    circuit_breaker_open: number,
    timeout: number
  },
  cache: {
    hit_rate: number,
    total_hits: number,
    total_misses: number
  },
  database: {
    query_count: number,
    avg_duration: number
  }
}

Notes

Metrics reset on Worker restart (no persistence)
Circuit Breaker state is per-instance (not shared across Workers)
lastFailureTime is only populated when failures exist
All timestamps are in ISO 8601 format (UTC)

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