I have connected grafana and prometheus in docker, but why is my crud application not displayed in prometheus?

my docker compose

crud:
    build:
      context: .
    container_name: crud_app
    env_file:
      - .env-non-dev
    depends_on:
      - db
      - redis
    command: sh -c "alembic upgrade head && gunicorn main:app --workers 1 --worker-class uvicorn.workers.UvicornWorker --bind=0.0.0.0:8000"
    ports:
      - 7777:8000

prometheus:
    image: prom/prometheus:v2.43.0
    container_name: prometheus
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yaml
      - prometheusdata:/prometheus
    restart: unless-stopped
    ports:
      - 9090:9090

my prometheus.yml

global:
  scrape_interval: 15s

  external_labels:
    monitor: 'codelab-monitor'

scrape_configs:
  - job_name: 'prometheus'

    scrape_interval: 5s

    static_configs:
      - targets: ['localhost:9090']

  - job_name: 'crud'
  
    scrape_interval: 5s

    static_configs:
      - targets: ['crud:8000']

when I connect at 127.0.0.1:9090 , then there are only one metrics from prometheus http://localhost:9090/metrics, and there is no my crud/metrics

I tried crud instead:8000 specify 127.0.0.1:8000