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I'm not saying this is the case at all, but I've noticed through experience that depending on how a system at scale is distributed that .1% outside your 99.9% may be impacting a specific user or group of users, or group of resources, or etc. So they may be getting 100% of their requests outside your 99.9% latency.

Something interesting to think about.

That's a great point and something pxx numbers often miss.

Zanzibar almost certainly has this type of behavior. More complex ACL structures under recent evaluations perform worse.

I'd love to see percentile data for depth of operation, but clearly the paper is limited in content size.

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