Application performance monitoring is more than just following the fault domain isolation workflow to determine the root cause of the problem that is reported by an end user. In many cases waiting for the end users to report problems simply takes too long, while the frustration due to poor performance grows. As much as we try to avoid performance problems, they do happen. It is inevitable. But it is possible to learn to react fast; and in some occasions fast enough that the impact on the end users is negligible. Despite operators’ best efforts, 73% of performance issues are reported by users, according to "APM: Getting IT on the C-Level’s agenda" report by Aberdeen Group. This number is quite large considering that less than 5% of all users typically bother to complain at all. User Experience has a significant impact on business success. According to the Aberdeen report poor performance of applications can reduce revenue by 9% and productivity by 64%.