To access usage information for any rule select Rules - Rule Usage from the main menu.
The General tab displays overall usage of the rule since it was created or last reset. If the rule has tracking turned on, there may be more than one stream displayed. The chart below represents activity through the rule within the last 30 seconds:
The Usage tab displays overall usage per day. Once again, if the rule has got tracking turned on, there may be sub-entries detailing per stream usage:
If a quota has been set for the rule, the Quota tab displays the usage of that quota:
There is also a separate report accessible via Tools - Usage Report in the main menu. It contains usage information grouped by day, then by rule and finally by stream for rules with tracking turned on: