After you upgrade from System Center 2012 Operations Manager Service Pack 1 (OpsMgr 2012 SP1) to System Center 2012 R2 Operations Manager, request counts are no longer available in Application Performance Monitoring (APM) reports. This occurs because the APM performance counter names for ".Net Apps" were changed to just "Apps" in the Operations Manager database, however there were no corresponding name updates in the Operations Manager Data Warehouse.
For all the details and a resolution, please see the following:
KB2984838 - Request Count data is missing from APM reports after upgrade to Operations Manager 2012 R2 (http://support.microsoft.com/kb/2984838)
J.C. Hornbeck| Solution Asset PM | Microsoft GBS Management and Security Division
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