Hi Ankur,
You can use this process to ensure monitoring during your upgrade:
Shut down and upgrade your MLS first, followed by your OneClick servers. Once those are all back up and running, do the rest of the primaries. Once those are completed and up and running, do all of the secondaries. Once it’s all done, you will need to cycle your tomcat services again, to ensure that the cache is updated properly with the updated server info (If you don’t do that last cycling, you will most likely see odd behavior with your OneClick).
Cheers
Jay