Changes in noise in regression test results

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### Expected behavior

The performance regression results have low noise

### Actual behavior

They fluctuate a bit, except during August - mid-November 2023. I wonder what happened then to make the results so stable, and whether that situation can be recreated.

### Steps to reproduce the behavior

The dashboard is here - https://search-rocksdb-bench-k2izhptfeap2hjfxteolsgsynm.us-west-2.es.amazonaws.com/_dashboards/app/dashboards#/view/9efe4fc0-fdd9-11ec-9f1d-b7bf4fe8d037. AFAIK it isn't publicly available, but here's a sample -

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