Hi JB,
I have been able to successfully create report parts that detail the specific number of times an event has taken place. To create a Bar Graph...you need to select 'Agent Procedure Name' as the Bar Category and the 'Log Time' as the Bar Value (with an aggregate of COUNT).
The downside is that it will not report on 0 events.
For example...if you want a graph to show backup success / failure and you have no failures for the last N days....then it will only show a single bar with the total value for all the Success events.
Let me know if you need further info.
Cheers
Josh