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No documentation changes needed.
See description in CASSANDRA-17205; this should have been applied on 4.0 and merged up but was overlooked.
Also double-check that strong leaks are logged at ERROR instead of WARN on both 4.0, 4.1, and trunk (see comment)
Merged SSTable files not reclaimed by OS
Backport CASSANDRA-17205 (remove strong self-ref in tidier) to all supported lines