Hello Andreas,
There aren't any rules to get the LEM to stop receiving logs, but how many logs the LEM can handle per day are constrained by resources.
LEM is designed as a compliance and reporting tool, so the intention is to log everything that is sent to the LEM if it can.
We do have some rules that you can use to help monitor the LEM, or if you have a tool such as NPM you can monitor the LEM via SNMP.
If you have additional information on what you're trying to do I may be able to suggest an alternative.