New schema change management code was introduced in hawkular-metrics 0.15.0. There were some bugs that break upgrades. Upgrading with 0.15.0 and 0.16.0 will not work. A few people have run into this. I have already submitted a PR with the fixes to be included in the next release. The ticket for this is https://issues.jboss.org/browse/HWKMETRICS-425.

- John