You can limit the number of alerts created for each check and every time it runs by adding a parameter in /REM/ADMIN on the Parameters tab:
add parameter MAX_ALERTS_PER_CHECK and enter a value in column PARAM_VALUE_LOW.
Note that this is not cumulative: when you run one check several times, it can create PARAM_VALUE_LOW alerts each time it runs.
This parameter has to be added manually and is not part of the default configuration. We recommend it for testing.