feat(metrics): add documentation for using grafana dashboard

docs/User Guide/User Guide/Advanced Usage/Metrics.md

@@ -105,4 +105,16 @@ scrape_configs:
 
 *   `400` - Invalid format parameter
 *   `401` - Missing or invalid ETAPI token
-*   `500` - Internal server error
+*   `500` - Internal server error
+
+## **Grafana Dashboard**
+
+<figure class="image"><img style="aspect-ratio:2594/1568;" src="1_Metrics_image.png" width="2594" height="1568"></figure>
+
+You can also use the Grafana Dashboard that has been created for TriliumNext - just take the JSON from <a class="reference-link" href="Metrics/grafana-dashboard.json">grafana-dashboard.json</a> and then import the dashboard, following these screenshots:
+
+<figure class="image"><img style="aspect-ratio:1881/282;" src="2_Metrics_image.png" width="1881" height="282"></figure>
+
+Then paste the JSON, and hit load:
+
+<figure class="image"><img style="aspect-ratio:1055/830;" src="Metrics_image.png" width="1055" height="830"></figure>