Exception listener could include timings for throwing + handling exceptions

[djluck]

[tiagotartari]

@djluck
Please, can you comment more on this implementation?

[djluck]

I recently came across an issue in production where an application was throwing thousands of exceptions/ sec, to the point where basically all CPU time was consumed with throwing exceptions. Having a histogram of times spent throwing exceptions could have been useful, as it would have allowed me to pinpoint the problem sooner.

As there is a start + stop event for throwing exceptions, we should be able to provide such a histogram fairly easily.