Alert Not Processed : exceeds the allowed value : 30,000 : Please enable handleHighFlow

Alert Not Processed : exceeds the allowed value : 30,000 : Please enable handleHighFlow

Dears

good day
i have this issue in event log analyzer ,
" Alert Not Processed : exceeds the allowed value : 30,000 : Please enable handleHighFlow"
and this cause stop sending email notification for events

any idea how to solve it ?