Blocker Description
In 2.3 we added a new method to RocksDBConfigSetter that will be called when a store is closed to clean up any resources that may have been created in #setConfig. Many large objects such as the block cache might be instantiated in that method, which will leak memory if not closed since they are backed by C++ objects.
We should consider removing the default implementation to force users to pay attention to whether they may be leaking memory, even if it may be a no-op for many. Remember to update the upgrade guide when we do so to maintain a clear list of the breaking changes in 3.0
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