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The WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat does not work well as a means for MongoDB to recognize cache pressure in the WT layer because it does not move like we need it to do.
In SERVER-36956 we replaced WT_STAT_CONN_CACHE_LOOKASIDE_SCORE with the WT_STAT_CONN_CACHE_LOOKASIDE_INSERT stat. This is because we saw problems noted in SERVER-40685, where the lookaside score can remain high even after cache pressure goes down.
The goal of this ticket is to create a workload to give to WT to demonstrate the problem so that they can fix it and confirm the problem is resolved.
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