Improvement
[CONTROLLER-1720] - Improve RangeSet tracking performance
[CONTROLLER-2011] - Do not use RangeSet in serialization
[CONTROLLER-2012] - Reconsider ImmutableUnsignedLongSet storage
[CONTROLLER-2013] - Improve closedTransactions storage in FrontendHistoryMetadata
[CONTROLLER-2014] - Improve UnsignedLongSet allocation rate
[CONTROLLER-2015] - Allow UnsignedLongSets to be merged
Task
[CONTROLLER-2018] - Enable testTransactionWithIsolatedLeader() with ClientBackedDataStore
Bug
[CONTROLLER-1942] - DeadTransactionException during initialization
[CONTROLLER-1991] - Tell-based protocol can leak transaction IDs on the backend
[CONTROLLER-2019] - Dead letters: raft.base.messages.SnapshotComplete
[CONTROLLER-2021] - Shard does not disable tracking on ReadyLocalTransaction
[CONTROLLER-2022] - Remote-to-local ready() replay fails with IllegalStateException