Filter Stream API: Operator rule to "return more than X tweets per second" vs. specifying a percentage sample
A rule operator of "no more than X tweets per second" is very similar to sampling. However, if it existed, it could theoretically set on every rule. This would allow knowing that no rules could absorb too much of total allowed volume, and to make sure that low volume rules aren't sampled, while higher volume rules still are. It would also mean that a rule that has a sudden burst of activity would not absorb all available volume at once. Without this operator, monitoring the volume on rules must take place, and sampling must be applied dynamically when volume increases or decreases.