Grafana + Prometheus: метрики и дашборды

Стек мониторинга через Docker Compose

version: '3.9'
services:
  prometheus:
    image: prom/prometheus:latest
    ports:
      - "9090:9090"
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
      - prometheus-data:/prometheus

  grafana:
    image: grafana/grafana:latest
    ports:
      - "3000:3000"
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin123
    volumes:
      - grafana-data:/var/lib/grafana

  node-exporter:
    image: prom/node-exporter:latest
    pid: host
    volumes:
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro

volumes:
  prometheus-data:
  grafana-data:

prometheus.yml: конфигурация сбора метрик

global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'node'
    static_configs:
      - targets: ['node-exporter:9100']

  - job_name: 'nginx'
    static_configs:
      - targets: ['nginx-exporter:9113']

Полезные PromQL запросы

# CPU utilization
100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100)

# RAM usage %
(1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) * 100

# Disk free
node_filesystem_avail_bytes{mountpoint="/"} / 1024 / 1024 / 1024