Hi @eespin, thanks for your comment and excuse me for my (chronically) late response. Harvest will not be an exporter in Prometheus, but will start an HTTP service for Prometheus to scrape the metrics. This was a bit harder to implement, but we did that since we want to be able to send metrics to other datasources (such as Graphite) as well, so Harvest needs to stay independent from Prometheus.
I am anticipating that we will have a canary release in mid-May, so eager customers can test it right away (we are also eager to get customer feedback from our side). But this depends on how smoothly things will go in the next 2-3 weeks. At the moment we already have a prototype running with Prometheus and so far things seem promising 🙂