Sorry for the churn, but @SuperQ pointed out some flaws in the way data was being stored in Prometheus and they're now fixed. This also means the three device dashboards (UAP, USG, USW) for Prometheus got minor updates again too. Please grab the new ones from Grafana.com.
This is also the first release that comes with GPG signed deb and rpm files. I'm working on setting up APT and YUM repos for easier upgrades. More on that soon!