services:
  << service_name >>:
    image: prom/prometheus:latest
    container_name: << service_name >>
    ports:
      - "<< port >>:9090"
    environment:
      - TZ=<< timezone >>
    command:
      - --config.file=/etc/prometheus/prometheus.yml
      - --storage.tsdb.retention.time=<< retention >>
    volumes:
      # Het configuratiebestand komt uit dit sjabloon; zonder dat weigert
      # Prometheus te starten. Eigen alertregels zet je in de rules-map.
      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
      - << appdata_dir >>/<< service_name >>/rules:/etc/prometheus/rules
      - << service_name >>_data:/prometheus
    restart: unless-stopped

volumes:
  << service_name >>_data: