Update README.md

Author: janvda

README.md

@@ -1,6 +1,6 @@
-# Edge Device (e.g. raspberry pi) Monitoring by means of composite docker application on [Balena OS](https://www.balena.io/os/).
+# Edge device (e.g. raspberry pi) monitoring by means of composite docker application on [Balena OS](https://www.balena.io/os/).
 
-This composite docker application monitors the system resources of the device where it is deployed on.  This application can be deployed through [BalenaCloud](https://www.balena.io/) on any arm device (e.g. a raspberry pi) running the [balena OS](https://www.balena.io/os/).
+This repository describes a composite docker application that monitors the system resources of the device where it is deployed on.  This application can be deployed through [BalenaCloud](https://www.balena.io/) on any arm device (e.g. a raspberry pi) running the [balena OS](https://www.balena.io/os/).
 
 It consists of the following three docker containers (= TIG stack)
 
@@ -10,14 +10,16 @@ It consists of the following three docker containers (= TIG stack)
 
 The Grafana user interface can be accessed (login and password is `admin`) at port 80 of the host OS.  This also means that you can access it through the `public device URL` that you can find in your [BalenaCloud](https://www.balena.io/) dashboard.  In other words you can access your Grafana dashboards wherever you have internet access !
 
-Here below a screenshot of the dashboard that is also provisioned by this application ( file is `grafana\dashboards\system metrics.json`)
+Here below a screenshot of the `system metrics` dashboard that is also provisioned by this application ( file is `grafana\dashboards\system metrics.json`)
 
 ![system metrics example](./system_metrics_dashboard.png)
 
-## Provisioning Grafana Dashboards
+## Updating / Adding new Grafana Dashboards
 
-If you want to add or update a Grafana Dashboard then this can be done through following steps:
+If you want to add a new Grafana Dashboard then this can be done through following steps (Updating happens in a similar way):
 
-1. Create (or Update) the dashboard in Grafana
-2. From the settings menu in Grafana select `View JSON` and copy the complete json file
-3. Create a file with extension `.json` in folder `grafana\dashboards` and ....
+1. Create the dashboard in Grafana
+2. From the settings menu in Grafana select `View JSON` and copy the complete json file (**don't use the grafana `export` feature** as this will template the datasource and will not work due to that).
+3. Create a file with extension `.json` in folder `grafana\dashboards` and paste the json contents you have copied in previous step into this file.
+4. Changes replace the ID number by null.  E.g. ` "id": 1,` should be changed into ` "id": null,`
+5. Commit your changes and push them to Balena Cloud.