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Endpoints

# JSON metrics
curl http://localhost:8080/metrics

# Prometheus format
curl http://localhost:8080/prometheus

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Key Metrics

MetricDescription
ultrabalancer_requests_totalTotal requests
ultrabalancer_requests_failedFailed requests
ultrabalancer_response_time_secondsResponse time histogram
ultrabalancer_backend_healthyBackend health (1=healthy, 0=unhealthy)
ultrabalancer_backend_active_connectionsActive connections per backend

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Prometheus Queries

# Requests per second
rate(ultrabalancer_requests_total[5m])

# Error rate
rate(ultrabalancer_requests_failed[5m]) / rate(ultrabalancer_requests_total[5m])

# p95 latency
histogram_quantile(0.95, rate(ultrabalancer_response_time_seconds_bucket[5m]))

# Healthy backends
sum(ultrabalancer_backend_healthy)

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JSON Response

{
  "total_requests": 1547823,
  "successful_requests": 1542891,
  "failed_requests": 4932,
  "avg_response_time_ms": 12.45,
  "p50_response_time_ms": 10.12,
  "p95_response_time_ms": 28.45,
  "p99_response_time_ms": 45.67,
  "requests_per_second": 17.91,
  "backends": [
    {
      "address": "192.168.1.10:8080",
      "healthy": true,
      "active_connections": 42,
      "total_requests": 515941
    }
  ]
}