And we knew that we couldn't start off with an edict that no page could *ever* be served with more than 6s of latency. Instead, we thought about probabilities that a customer would have a bad session, which led us to set our SLAs at percentiles.
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What are overstats? (I tried googling for the term, but it's buried in overwatch results.)
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A simple count of the number of data points over a given value. Eg the 1ms overstat counts every data point over 1ms.
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They are, but I haven’t seen anybody implement them well. Presumably because they are computationally expensive for non hard coded values?
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Calculating overstats using an exponentially bucketed histogram (with bounded error) isn't too hard. O(N) in the number of buckets.
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