On New Relic dashboards, using the GUI I can add a second query to a chart.
I cannot find any documentation for the terraform provider that shows how to do this. It just shows a “widget” which has a "nrql = " value that can be set to one query, and creates a chart with that one query.
Hi @cos1, since this isn’t currently supported by the API, we can’t support it in the Terraform provider just yet. However, there is work being done to support this in the future. 
Do you have an estimate of when this will happen? It seems like the API for dashboards is very weak and pretty much un-usable, which means newrelic effectively doesn’t support infrastructure-as-code for dashboards and charts currently. That seems like a very huge gap in the product and I hope it’s one of your top priorities and that you can give an estimate.
Hi @cos1, thank you for your feedback and I understand your frustration. We do not have an exact timeline for when there will be an update on this but I can assure you that once there is, we will let the community know.