To begin RTI performance data collection after installing the RTI cartridge, and the license, you need to restart your application. To restart your application from the management console:
  1. navigate to the application page from the My Applications tab
  2. click the restart icon and click the Restart button to confirm
Click the Restart Icon
 
Confirm Restart
 
Note that some applications take a while to restart, and the management console will time out but the application usually restarts properly.
To restart your application from the command line:
$ rhc app restart -a myApp
Password: ***************

RESULT:
myApp stopped
myApp started