SERVER-35449 requires the oldest timestamp in use by an active transaction for reporting in serverStats. Currently the closest option is "pinned" in query_timestamp.
- is depended on by
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                    SERVER-35449 Return the oldest read timestamp used by any open transaction -         
- Closed
 
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- related to
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                    SERVER-40337 Remove oldestOpenUnpreparedReadTimestamp -         
- Closed
 
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