Sum the values across the evaluation context. This is typically used to approximate the
distinct number of events that occurred. If the input is non-negative, then each datapoint
for the output line will represent the area under the input line from the start of the
graph to the time for that datapoint. Missing values, NaN, will be treated as zeroes.
For example:
Input
:integral
0
0
1
1
-1
0
NaN
0
0
0
1
1
2
3
1
4
1
5
0
5
For a counter, each data
point represents the average rate per second over the step interval. To compute the total
amount incremented, the value first needs to be converted to a rate per step interval.
This conversion can be performed using the :per-step operation.
