This module sums all the values in the time-frame requested.
You can use
sum to find the volume of something over a period.
Use it in alarms like this:
sum does not change the units. For example, if the chart units is
requests/sec, the result
will be again expressed in the same units.
It can also be used in APIs and badges as
&group=sum in the URL.
Examining last 1 minute
successful web server responses: