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The kona-node exposes metrics by default. Optionally, metrics can be disabled with the --metrics.disabled cli flag. Unless otherwise specified, metrics are exposed on port 9090. To grab a snapshot of the metrics, you can visit 0.0.0.0:9090 or curl the url. 
curl 0.0.0.0:9090
The output should be raw text mapping metrics with their values. Remember, this is just a snapshot of the metrics at that point in time. To record and visualize the metrics, we’ll use Grafana and Prometheus.

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Grafana and Prometheus

Prometheus is a simple service that scrapes metrics at a predefined interval. Grafana then uses Prometheus as a “Data Source” to visualize the collected metrics. The Reth book provides a great overview to setting up Prometheus and Grafana. Visit the Reth docs to follow along. The kona-node comes shipped with a default Grafana dashboard for the kona-node. To import the dashboard to grafana, click the + icon > Import Dashboard > paste the contents of kona’s dashboard in the textbox > Load.