I have used below query to get the total number of requests by regions in last 30 days.
requests
| summarize count_=sum(itemCount), avg(duration)
by bin(timestamp, 1h), client_StateOrProvince, client_City
| order by timestamp asc, client_StateOrProvince, client_City
Here is results
But, I am looking for region wise (west us, east us..) , I am not able to find right column names?