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fixes #6100 #6232 track memory usage in each txn's range buffer, resetting on txn commit and in the escalation callback. large write transactions that get redundant locks in the locktree will now be under control.


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fixes #6205 handle the case where a transaction has not yet noted a locktree during the escalation callback


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Cleaned up maybe_fsync code.

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refs #5638 Fix bug in tests where we were passing in txnid as the boolean "do_fsync" in logcursor tests

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fixes #6113 add instrumentation to the locktree, including memory stats, escalation stats, and single txnid optimization stats


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refs #6040 get random insertions working in our examples by increasing the cache size to 1G and turning checkpointing on

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fixes #5961 pass a callback to the ydb layer when escalation occurs for a txnid, providing the locktree and range_buffer describing how to update the txn's internal data structures so they don't grow out of control for very long lived write transactions


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refs #5949 make recovery_fileops_unit clean up after itself, might solve the space problem on the mac machine


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refs #5949 suppress valgrind on the first (crashing) execution of recovery_fileops_unit.tdb, for some reason raise(SIGKILL) hangs valgrind in that test

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