Application Performance Monitor (APM)

Application Performance Monitor (APM) is used to monitor application performance. This help you identify problems with your application. If you are developing an application, this is very helpful as you can see changes in application performance during a software upgrade, this allow you to identify perofrmance issues related to changes in your application.

Here are some useful sites that provide Application Performance Monitoring solutions.

https://blackfire.io

https://newrelic.com/