07c83f555d
To observe the performance of the ZK connection and the new tree caches, add some statsd metrics for each of these. This will let us monitor queue size over time. Also, update the assertReportedStat method to output all received stats if the expected stat was not found (like Zuul). Change-Id: Ia7e1e0980fdc34007f80371ee0a77d4478948518 Depends-On: https://review.opendev.org/886552