It's WAS. Let's say I have 10 users logged in through web server but doing activities in app. Now I want to see in a given time frame how many requests these 10 users are making to app server. If we go for hits on web server for login, then total requests would be 10 but since they are doing different activities in app server so they are making continuous request to app server and total request count would get increased. This is what I want to see.