Prometheus connection and metrics

[PauBaguer]

Hi there,
I have been trying to get outputs out of the simulator, metrics to analyze. Onos-cli ransim provides the metrics API to get and set metrics, but by default, there does not seem to be any metric that is periodically updated. On the other hand, the Architecture section on README.md shows a metrics block connecting with Prometheus. I have been trying to connect it to Prometheus but the 5150 port does not answer Prometheus queries. In the helm charts, there is a 9090 port defined that I assume could be dedicated at the metrics API, but there is no process serving that port.
Is there a way of connecting with Prometheus? Is it not yet implemented? In general, is there any output to the simulator other than the logs?