Add GCRA rate limiting strategy#358
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amir-h-rassafi wants to merge 4 commits into
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Summary
Adds a GCRA rate limiting strategy with configurable burst tolerance.
Includes memory, Redis/Valkey, and async Redis storage support, plus docs and benchmarks.
Note
GCRA stores one theoretical-arrival timestamp per key, which keeps weighted or long-window limits cheaper than moving-window storage. It uses continuous refill semantics, so it is not an exact moving-window replacement.