HI Antonello,
The manager module package also has SMM_EMExt.jar which needs to be deployed to the collectors (to the ext folder), this performs a similar function to a Javascript calculator but it is built as an EM extension which is more efficient.
This file has existed with previous versions so I would make sure you use an updated file, as I assume some metric names would have changed.
The file does not need to be put on the MOM because it will process the data from agents and the agents do not send data to the MOM.
There are Javascripts in there as well but they are designed to process the OS monitoring that is no longer a part of the product.
Thanks,
David