Function RequestRateDecorator

The decorator collects statistically significant query processing times skewed toward the last 5 minutes to examine their distribution.

 - **count** - The total of all values added to the meter.
 - **1MinuteRate** - The rate of the meter biased towards the last 1 minute.
 - **5MinuteRate** - The rate of the meter biased towards the last 5 minute.
 - **15MinuteRate** - The rate of the meter biased towards the last 15 minute.
 - **min** - The lowest observed value.
 - **max** - The highest observed value.
 - **sum** - The sum of all observed values.
 - **variance** - The variance of all observed values.
 - **mean** - The average of all observed values.
 - **stddev** - The stddev of all observed values.
 - **count** - The number of observed values.
 - **median** - 50% of all values in the resevoir are at or below this value.
 - **p75** - See median, 75% percentile.
 - **p95** - See median, 95% percentile.
 - **p99** - See median, 99% percentile.
 - **p999** - See median, 99.9% percentile.
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