Adding note.

useful-extras/alternative-graphing-with-prometheus-grafana.md

@@ -108,3 +108,7 @@ Clicking `Save & Test` should return a green message indicating success. The das
 4. Click `Import` on the subsequent dialogue box
 
 At this point you should see a very nice dashboard, you can find it under `General` in the `Dashboards` section.
+
+### Note
+
+For more information and troubleshooting tips, visit https://github.com/sdr-enthusiasts/docker-adsb-ultrafeeder/blob/main/README-grafana.md, which includes much detailed information.