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Remove snapshot window logic, see SERVER-31767.
- This logic was used to dynamically change the amount of history stored to avoid cache pressure. Given durable history is available now, this is no longer needed.
- Delete metrics in the "snapshot-window-settings" subsection of the wiredTiger serverStatus section that are no longer relevant.
- "cache pressure percentage threshold"
- "max target available snapshots window size in seconds”
- "target available snapshots window size in seconds"
Add metric "minimum available snapshots window size in seconds".
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