How to set notification or bulletin board message in 'HandlehttpRequest' processor property 'Maximum threads' queue size.

[#1]

I have a use case, where i wants to capture threshold value of a 'Maximum Threads' size in an HandlehttpRequest processor and notification should send to bulletin board  or any event form message. 

the maximum value we can set is 1000 (one thousand) and if it's reached to 700 then a flowfile/event/bulletin board message would initiate with this information that Maximum threads limit about to breach.