datastore/tests/integration/compose/docker_compose_prometheus_reader.yml

services:
  # Service "prometheus_reader" runs a prometheus server which scrapes nothing and can request data via the RemoteRead protocol
  # from ClickHouse by url ${PROMETHEUS_REMOTE_READ_HANDLERS}.
  prometheus_reader:
    image: prom/prometheus:v3.5.0
    hostname: ${PROMETHEUS_READER_HOSTNAME:-prometheus_reader}
    restart: always
    entrypoint: |
      /bin/sh -c '
      cat << EOF > /etc/prometheus/prometheus.yml
        remote_read: ${PROMETHEUS_REMOTE_READ_HANDLERS}
        storage:
          tsdb:
            out_of_order_time_window: 100y
      EOF
      exec /bin/prometheus --config.file="/etc/prometheus/prometheus.yml" --storage.tsdb.path="/prometheus" --web.listen-address="0.0.0.0:${PROMETHEUS_READER_PORT}" --enable-feature=promql-experimental-functions &> /var/log/prometheus/prometheus.log
      '
    expose:
      - ${PROMETHEUS_READER_PORT}
    healthcheck:
      test: curl -f "http://localhost:${PROMETHEUS_READER_PORT}/api/v1/status/runtimeinfo" || exit 1
      interval: 5s
      timeout: 3s
      retries: 30
    volumes:
      - type: ${PROMETHEUS_READER_LOGS_FS:-tmpfs}
        source: ${PROMETHEUS_READER_LOGS:-}
        target: /var/log/prometheus
    stop_grace_period: 5s
    cpus: 3