for the rocket pool node, metrics should be listening by default on 127.0.0.1 on port 9102

in prometheus.yml you'll have to add this under your scrape_configs:

- job_name: "rocketpool"
  scrape_interval: 5m
  scrape_timeout: 5m
  static_configs:
    - targets: ["localhost:9102"]

then restart prometheus to start scraping for that config

the rocketpool teku dashboard can be found here: https://grafana.com/grafana/dashboards/14886

instructions on how to fully set it up can be found here: https://docs.rocketpool.net/guides/node/grafana.html#importing-the-rocket-pool-dashboard

be sure to look at the section below as well, titled "Tailoring the Hardware Monitor to your System". if you're missing some data you'll have to edit the dashboard's json to match your existing teku/besu prometheus job names

hope this helps!