Feature Request: Reporting being able to sum events

We have cases were we want to have report that is the SUM of the counts of multiple events.

e.g. Event A, Event B and Event C.

We want a single line chart that shows the SUM(EventA, EventB, EventC) as one series in the chart.

Today, you cannot do this. You can:

1. Plot them as individual data series (not what we want)
2. Create another event that combines them then build a report on this event

#2 will technically work, but is wasteful because it is defining another event for a single purpose of one report.