configs:
    prometheus.yml:
        external: true
...

services:
    prometheus:
        image: prom/prometheus
        ports:
            - 9090:9090
        configs:
            - source: prometheus.yml
              target: /etc/prometheus/prometheus.yml
        volumes:
            - prometheus_db:/prometheus
        command:
            - '--config.file=/etc/prometheus/prometheus.yml'
            - '--storage.tsdb.path=/prometheus'
            - '--storage.tsdb.retention.time=200h'
            - '--web.enable-lifecycle'
        restart: unless-stopped
        labels:
            org.label-schema.group: 'monitoring'

# my global config
global:
    scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
    evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
    # scrape_timeout is set to the global default (10s).

    # Attach these labels to any time series or alerts when communicating with
    # external systems (federation, remote storage, Alertmanager).
    external_labels:
        monitor: 'docker-monitor'

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
    # - "first.rules"
    # - "second.rules"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
    - job_name: 'prometheus'
      static_configs:
          - targets: ['localhost:9090']

    - job_name: 'nodeexporter'
      scrape_interval: 5s
      static_configs:
          - targets: ['localhost:9100']

    - job_name: 'web-app'
      scrape_interval: 5s
      static_configs:
          - targets: ['localhost:3000']

docker config ls
ID                          NAME                CREATED             UPDATED
33hhc9ror6ztsu2mb25fm4rrl   prometheus.yml      38 minutes ago      38 minutes ago

sg="Error loading config (--config.file=/opt/prometheus.yml)" err="open /opt/prometheus.yml: no such file or directory"

configs:
            - source: prometheus.yml
              target: /etc/prometheus/prometheus1.yml
        command:
            - '--config.file=/etc/prometheus/prometheus1.yml'

ports:
            - 6000:3000