inspectIT
inspectIT is the leading Open Source APM
...Various sensors capture end-to-end information for every request from the end user, to the business tier all the way to the backends. inspectIT is based on an application-centric, business-focused approach, where each technical request is mapped to an application and to a business use case. With inspectIT you always know about the health of your software and can easily analyze any problems that arise. For Web applications, the tool integrates the End user monitoring using automatic JavaScript agent injection. This allows easy monitoring of the performance that real users are facing in the browser. In addition, the inspectIT can correlate all user actions in the browser to the backend traces, thus providing a complete picture on the user experience.