Eliminate lock in ConcurrencyLimitingRequestThrottler #2025
+80
−100
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Following up from #1957 this moves to a complete lock-free implementation.
(cc @tolbertam who reviewed the previous PR, and @akhaku and @clohfink who have reviewed internally).
Commits are broken to smaller steps in case it's helpful in review. I will do a squash/rebase when OK.