Just a short notice to all people who are using or monitoring Windows Server 2012 with System Center Operations Manager 2012 (both RTM and SP1), or managing those with SCVMM 2012 or SCDPM 2012. There is a very important hotfix which fixes a handle leak in WMI. Extract from KB:

 

This issue occurs because, when Performance Data Helper log files are opened, Pdh.dll creates a new thread by using the CreateThread() API to process the log files. The CreateThread() API then returns a handle to the newly created thread. The handle remains open after these log files are closed, causing a handle leak.

To download the hotfix, go to download location: http://support.microsoft.com/kb/2790831/en-us

Happy monitoring!