x-defaults: &defaults
  restart: unless-stopped
  logging:
    driver: json-file
    options:
      max-size: 100m
      max-file: "3"

services:
  prometheus:
    <<: *defaults
    image: ${GLOBAL_REGISTRY:-}prom/prometheus:${PROMETHEUS_VERSION:-v3.5.0}
    ports:
      - "${PROMETHEUS_PORT_OVERRIDE:-9090}:9090"
    volumes:
      - prometheus_data:/prometheus

      # Optional: Mount custom configuration
      # - ./prometheus.yml:/etc/prometheus/prometheus.yml
      # - ./rules:/etc/prometheus/rules
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/etc/prometheus/console_libraries'
      - '--web.console.templates=/etc/prometheus/consoles'
      - '--storage.tsdb.retention.time=${PROMETHEUS_RETENTION_TIME:-15d}'
      - '--storage.tsdb.retention.size=${PROMETHEUS_RETENTION_SIZE:-}'
      - '--web.enable-lifecycle'
      - '--web.enable-admin-api'
      - '--web.external-url=${PROMETHEUS_EXTERNAL_URL:-http://localhost:9090}'
    environment:
      - TZ=${TZ:-UTC}
      - PROMETHEUS_RETENTION_TIME=${PROMETHEUS_RETENTION_TIME:-15d}
      - PROMETHEUS_RETENTION_SIZE=${PROMETHEUS_RETENTION_SIZE:-}
    user: "65534:65534"  # nobody user
    deploy:
      resources:
        limits:
          cpus: ${PROMETHEUS_CPU_LIMIT:-1.0}
          memory: ${PROMETHEUS_MEMORY_LIMIT:-2G}
        reservations:
          cpus: ${PROMETHEUS_CPU_RESERVATION:-0.25}
          memory: ${PROMETHEUS_MEMORY_RESERVATION:-512M}
    healthcheck:
      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:9090/-/healthy"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 30s

volumes:
  prometheus_data: