How to monitor a process that resets itself every night.

How to monitor a process that resets itself every night.

I want to monitor the w3wp.exe process which is the appool process for IIS (Microsofts web server).  I have one of these per web site (multiple sites & processes) on a web server. At midnight IIS resets the process automatically which cuases the process ID to change which OpsManager cannot deal with.  Is there a way to account for this?  I want to monitor the memory these processes are consuming.     

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