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Created by: keegancsmith
As far as I can tell this mutex serves no purpose. The only possible purpose is to serialize calls to UpdateFromDiff. However, the individual upsert and remove calls on the scheduler and queue have there own mutexes.
Possibly if we had two concurrent UpdateFromDiff we could have an
inconsistent state, but it would converge at the next UpdateFromDiff
call. Additionally we only have one call site for UpdateFromDiff, and
that never runs concurrently.