Computes the time when the minimum was reached for the first time in the period.
Computes the time when the maximum was reached for the first time in the period.
Computes the difference between the last and first value within the period. If there are multiple adjacent periods, computes delta as the difference between the last values of adjacent periods.
Similar to delta except for special processing of resets. Applicable for incrementing non-negative metrics. Reset occurs when the series value is lower than the previous value, in which case the counter adds the difference between 0 and the current value.