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VAULT-31264: Limit raft joins (#28790)
* Switch from an unbounded Map to an LRU, 429 when exceeding it's size, and repeat challenges to the same server rather than encrypting new ones * Prune old challenges * Remove from pending only if the answer is correct * Add a unit test that validates 429s, delays, and eviction of old entries * Switch to using a flat token bucket from x/time/rate * remove from LRU on each challenge write * Remove sleep, simplify unit test * improve const names * additional tests * max answer size * add locking to prevent multiple new challenges * remove log line --------- Co-authored-by: Scott G. Miller <smiller@hashicorp.com>
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