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Summary: Before this change, we would always include the shard id in our mysql-related fb303 counters. This is not perfect for two reasons: - the the xdb blobstore we have 4K shards and 24 counters, so we were reporting 96K counters in total - we rarely care about per-counter metrics anyway, since in most cases all queries are uniformly distributed Therefore, let's change this approach to not use per-shard counters and use per-shardmap ones (when sharding is involved). Reviewed By: krallin Differential Revision: D16360591 fbshipit-source-id: b2df94a3ca9cacbf5c1f328b48e87b48cd18287e |
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