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Documentation Index

Fetch the complete documentation index at: https://docs.draskencloud.com/llms.txt

Use this file to discover all available pages before exploring further.

Nexus exposes Prometheus metrics at /metrics on the management port (9090).

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Scrape Endpoint

GET http://localhost:9090/metrics
No authentication is required for the metrics endpoint.

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Prometheus Configuration

Add Nexus as a scrape target: 
scrape_configs:
  - job_name: nexus
    static_configs:
      - targets: ["nexus:9090"]
In Kubernetes, use a ServiceMonitor if you have the Prometheus Operator: 
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: nexus
  namespace: drasken-infra-dev
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: nexus
  endpoints:
    - port: mgmt
      path: /metrics
      interval: 30s

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Key Metrics

MetricTypeDescription
gateway_requests_totalCounterTotal proxy requests by app, version, status
gateway_request_duration_secondsHistogramRequest latency distribution
gateway_upstream_errors_totalCounterBackend errors by revision
gateway_circuit_breaker_stateGaugeCircuit state per revision (0=closed, 1=open, 2=half-open)
gateway_cache_hits_totalCounterCache hit count
gateway_cache_misses_totalCounterCache miss count
gateway_rate_limit_hits_totalCounterRate limit rejections
gateway_auth_failures_totalCounterAuth failures by type
gateway_uptime_secondsGaugeProcess uptime

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Grafana Dashboard

Import the dashboard using the Prometheus datasource. Key panels to build:
  • Request rate by app (rate(gateway_requests_total[5m]))
  • P99 latency (histogram_quantile(0.99, gateway_request_duration_seconds_bucket))
  • Error rate (rate(gateway_upstream_errors_total[5m]))
  • Circuit breaker state (gateway_circuit_breaker_state)