Grafana dashboard should be public usable

[berendt]

As an operator I want to allow public access to my OHM Grafana Dashboard.

Enable public dashboards (https://grafana.com/docs/grafana/latest/dashboards/dashboard-public/):

[feature_toggles]
publicDashboards = true

Make dashboard public available via the Grafana dashboard share feature.

At the moment this is not possible because of:

This dashboard cannot be made public because it has template variables

[garloff]

If I understand correctly, we need to do two things:

1. Set this feature toggle in the config file
2. Avoid using template variables

I am afraid, the latter is difficult to do. The dashboard allows selecting the cloud and then filtering for all kind of things (e.g. only see stats for nova API calls etc.). These are features that I would not want to miss ...