We currently run Gerrit 3.3.6 which should still be supported for a year but we should plan on upgrading to 3.4.
Release notes https://www.gerritcodereview.com/3.4.html
Some notes:
- Java 11 by default (we already run under Java 11)
- Schema change to add search operators mergedafter and mergedbefore
Breaking change
- is:mergeable is disabled per default. It should as well on our current setup but we can still use it https://gerrit.wikimedia.org/r/q/is:mergeable
- HTML plugin support is removed. Some JavaScript plugin API got removed.
And a few new features.