default dashboard oriented towards Cloud Metrics

* Remove the labels to account for the case there are many servers (branched from Gary's gist here https://gist.githubusercontent.com/gdusbabek/c3feab2849f9583797b4/raw/cf46c35a9cef5190edef0c54c8a1e9b7808172a3/cloud_metrics_default_dashboard.json)
* Added top row with instruction and images.

![Screenshot](https://www.evernote.com/shard/s215/sh/7dfaa7b6-8df9-49c9-89e4-88bb0f03297d/f758abcd3ca29f5585e0f8c8a14ff1a4/deep/0/Grafana---default.png)