How do I find out what patch forced a reboot?

How do I find out what patch forced a reboot?

Hello, 

I have automated patch management enabled in Desktop Central and until now it was doing a great job.  It installed a patch on my PC and forcefully rebooted it without giving me any options.  I have the Do Not Reboot flag checked in the deployment policy. Any idea on where I can start looking to see what patch forced the reboot so i can disable it? 

Thanks
Anthony  

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