Dashboard shows data only after running pulsar-admin command (docker, standalone)

Describe the bug I am using docker-compose to run pulsar in standalone mode together with dashboard. However, my dashboard stays empty until I run bin/pulsar-admin clusters list inside the pulsar container.

To Reproduce Steps to reproduce the behavior:

1. Create docker-compose.yaml

# docker-compose.yaml
version: "3.7"
services:
  apache-pulsar:
    hostname: apache-pulsar
    image: apachepulsar/pulsar:2.3.2
    command: ["bin/pulsar", "standalone"]
    ports:
      - "6650:6650"
      - "8080:8080"
  apache-pulsar-dashboard:
    hostname: apache-pulsar-dashboard
    image: apachepulsar/pulsar-dashboard
    ports:
      - "80:80"
    environment:
      - SERVICE_URL=http://apache-pulsar:8080

1. Run docker-compose up
2. Go to http://locahost and check the dashboard. It does not show data.
3. Run docker exec apache-pulsar /bin/bash
4. Run bin/pulsar-admin cluster list inside the container
5. The dashboard now shows data (might need a refresh).

Expected behavior Have the dashboard show data without running a command in the container.

Desktop (please complete the following information):

• OS: macOS but running in docker containers

Additional context Might be related to #3367

[skyrocknroll]

@sijie When we restart all the brokers we don’t see any topics or namespace in the dashboard even though it exists. Only after producing and consuming in the topic the topics appear in the dashboard. is it expected or bug?

[sijie]

Pulsar dashboard is deprecated in favor of using Pulsar Manager. http://pulsar.apache.org/docs/en/administration-pulsar-manager/

So close this now. If you have any questions, please re-open it.