# node-exporter — host-level signals (CPU, memory, filesystem, ...).
# Reads the HOST's /proc, / and /sys read-only into the container
# (same flags as the OlliTeX toolkit node-exporter).
services:
  node-exporter:
    image: ${NODE_EXPORTER_IMAGE:-prom/node-exporter:v1.9.1}
    container_name: node-exporter
    hostname: node-exporter
    restart: unless-stopped
    command:
      - "--path.procfs=/host/proc"
      - "--path.rootfs=/host"
      - "--path.sysfs=/host/sys"
    ports:
      - "127.0.0.1:${NODE_EXPORTER_PORT:-9100}:9100"   # host admin only (SSH tunnel)
    volumes:
      - /:/host:ro
    healthcheck:
      test: ["CMD", "wget", "-qO-", "http://127.0.0.1:9100/metrics"]
      start_period: 15s
      interval: 30s
      retries: 5
      timeout: 5s
    networks:
      - overleaf-network

networks:
  overleaf-network:
    external: true