Notable next steps include:
* Intelligently select the aggregation method (rate/avg_over_time/etc).
* Intelligenty select the aggregation window.
* Figure out how to handle "namespace", if at all.
* Fix the crazy type conversion in `sample_converter.go`.
Working through some of the result conversions.
I want to use this code in a harness project to exercise some of it, but there are some versioning issues around my modified code vs. the current version of the real project. The easiest way to work around them at the moment is to push this.
