Here are some prebuilt dashboards that you can add to your Grafana instance. To import follow the Grafana docs here
Metrics are enabled by default. By default, metrics will be sent to
prometheus.DefaultRegisterer. To use a different Registerer use the libp2p
option libp2p.PrometheusRegisterer.
Use the share functionality on an existing dashboard, and make sure to toggle "Export for sharing externally". See the Grafana Docs for more details.