I'm following this Grafana integration guide (https://flower.readthedocs.io/en/latest/prometheus-integration.html#grafana-integration-guide) and attempting to connect Prometheus service to Flower.

I can see that Flower is reachable internally as "celery-flower.railway.internal" so I've set that as the target in prometheus.yml

global:
  scrape_interval:     15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: prometheus
    static_configs:
      - targets: ['localhost:9090']
  - job_name: flower
    static_configs:
      - targets:
          - "celery-flower.railway.internal"

However Prometheus is not able to connect to this service, why is this?

Thanks!