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:-v3.5.1}
    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: