When updating QueueMetrics, whether you do that manually or using yum, you need to copy web.xml
from the old installetion to the new one.
This is easy to do, as distinct QM applications are stored as:
So they are never deleted.
Before the upgrade, make a backup of the QM database; it may be updated by the QM updater on the first run, so it is better to have a copy - just in case.
After the upgrade, have a look at the WEB-INF/README/Updating.txt file - it shows the new parameters and the new security keys that you m,ay have to enable on an existing install in order to unlock the new functionalities.