Set `stats_enabled: true` in your `inventories/<your_inventory>/group_vars/nas.yml` file. If you want to gather metrics on your internet connection, enable `stats_internet_speed_test_enabled` too.
If you want to access Grafana externally, set `stats_grafana_available_externally: true` in your `inventories/<your_inventory>/group_vars/nas.yml` file. If you want to access Promethehus externally, set `stats_prometheus_available_externally: true` in your `inventories/<your_inventory>/group_vars/nas.yml` file.
The Grafana web interface can be found at [http://ansible_nas_host_or_ip:3000](http://ansible_nas_host_or_ip:3000), Prometheus can be found at [http://ansible_nas_host_or_ip:9090](http://ansible_nas_host_or_ip:9090)