After "HBASE-23326 Implement a ProcedureStore which stores procedures in a HRegion" and related issues are resolved, I think the last flaky part of the proc-v2 framework has been resolved.
Notice that this does not mean there is no bug. The problem for the old procedure store is that, no one in the community can even touch the code. So even if we know there are bugs, no one can fix them. As now it is rely on a region, I'm sure that most people in the community, even not a committer, can modify the code easily. So the plan here is to cut branch-2.3, and start to stablize it. And once 2.3.0 is out, I will do a final 2.1.x release and mark branch-2.1 as EOL. Suggestions are welcomed. Oh, we need a release manager for branch-2.3. Any volunteers? Thanks.
