That's really interesting, would you be keen on open sourcing that bit if you've not already? I know Raj and the rest of the crew are pretty all in on open source.

Edit: guessing it is: https://github.com/grafana/grafonnet-lib#examples ?

+1 for using jsonnet. An adequate language for this kind of task! (Here "adequate" is meant as high praise... too often the choice of config langauge isn't.)

You might be interested in the Indicator Protocol: https://github.com/pivotal/monitoring-indicator-protocol