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provision more machines for eqsin caches
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Description

Unlike most other edge sites, eqsin and ulsfo have 6 machines per cluster, not 8. ulsfo sees much less traffic, so this is fine there; however, eqsin has become a sizable fraction of our overall traffic at its daily peak: approx as loaded as eqiad's peak; approx 1/3rd of esams peak; and approx 1/3rd of global rps at eqsin daily peak.

We should probably increase from 6->8 machines for upload and text in eqsin.

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