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Summary: Add rate limiter statistics that make it easier to diagnose whether RocksDB background IO is being throttled by the GenericRateLimiter. New ticker counters: - rocksdb.rate.limiter.bytes.read/write: bytes granted by the limiter, split by operation type. - rocksdb.rate.limiter.requests.read/write: requests granted by the limiter, split by operation type. - rocksdb.rate.limiter.delayed.requests.read/write: requests that actually had to wait for a future refill because available tokens were exhausted. - rocksdb.rate.limiter.total.wait.micros.read/write: cumulative wait time for delayed requests. New histograms: - rocksdb.rate.limiter.wait.micros.read/write: per-request wait latency for delayed requests, enabling percentile debugging. GenericRateLimiter now overrides the OpType-aware Request() path so these stats preserve the configured limiter mode. The legacy three-argument Request() path is treated as write IO for compatibility. Existing NUMBER_RATE_LIMITER_DRAINS is left intact, but the new delayed request counters are the clearer signal for out-of-token throttling because one delayed request can observe multiple drain intervals. Also update the Java ticker and histogram mappings so Java consumers can access the new statistics. Pull Request resolved: https://github.com/facebook/rocksdb/pull/14884 Test Plan: - make format-auto - make -j16 rate_limiter_test statistics_test - ./rate_limiter_test - ./statistics_test - make check-sources Reviewed By: anand1976 Differential Revision: D109694030 Pulled By: xingbowang fbshipit-source-id: e92756788ba629f25655958c7beb91099184cda4