You can use a Python script to cause the autonomic request flow manager (ARFM) to forget all of its historical data.
The arfmcontroller/py script is located in WebSphere_home\appserver\lib\visualization.cacheservice.jar.
To run the DataReaderWrapper class from a command line, use the following command:
wsadmin ./wsadmin.sh -f arfmController.py -lang jython reset