A full list of all the fixes and enhancements can be seen here:
https://support.microsoft.com/en-us/help/3209587/system-center-2012-r2-om-ur12
I've yet to deploy this update into my lab but I'm particularly intrigued by this one:
- Because of incorrect computations of configuration and overrides, some managed entities go into an unmonitored state. This behavior is accompanied by event 1215 errors that are logged in the Operations Manager log.
I've noticed managed entities going into an unmonitored state after applying overrides or changing distributed application configurations a lot over the last couple of years and it'll be interesting to see if this update sorts out the issue.
As should be the case for everyone deploying this update, test it in non-production environments first and be sure to read through Kevin Holman's excellent step-by-step guide to understand the order for which to apply the update and the additional manual steps that are needed:
https://blogs.technet.microsoft.com/kevinholman/2017/01/30/ur12-for-scom-2012-r2-step-by-step/
