You can not, nor should you try to turn off these notifications. You need to understand root cause and correct vs. breaking the system. Did you enable Send Alerts on Errors for every Client? If you do not want to figure out root cause then you maybe able to update agents to turn off alerts in the logging section of agent configuration:
I would create a ticket first if not already done so just to see if this is something that needs to be fixed vs. ignored.
thank you Steve