How to integrate promtheous and grafana with nakama?

I need to see nakama metrics on Grafana, and after that I need to define an alarm system on Prometheus.

based on this doc its possible but I don’t know how to add support to the project? do I need only to add 9100 as exposed ports to be able to list to events on the Nakama or there are more changes to the nakama project?

From Nakama, all that’s needed to scrape the metrics from Prometheus is to enable the port and correctly setup Prometheus to scrape it.