If you are getting hammered by a robot, you’ll probably want to find out the IP Address of the robot to see if it is a friendly one, or just someone playing with Kali Linux in a far off land.
The following Log Parser Studio query will get you a list of your top offenders:
SELECT c-ip, count(c-ip) as requestcount FROM '[LOGFILEPATH]' WHERE date = '2016-03-29' GROUP BY c-ip ORDER BY count(c-ip) DESC
Just change the date as you need.
Web Log Importer
If you are using Web Log Importer, you can get the same information using the following query:
SELECT [c_ip], COUNT(1) FROM LogEntry WHERE [date] = '2016-03-29' GROUP BY [c_ip] ORDER BY COUNT(1) DESC