You may see several results in the Activity view that have the same IP address. Why doesn't Spring Metrics aggregate those visitors into one visitor with multiple visits? After all, if the visitors have the same IP address they must be the same person, right?
Here's why it might not be the same person. It is possible (and common) for many people at one location to have the same IP address. Common examples are businesses, schools, or any other group of people at the same location on the same network. Each separate computer on a network like that has its own internet browser, and each browser has a unique key associated with it. So when someone visits your site, Spring Metrics is able to detect that browser key and display the visitor as a unique visitor. And that's why you might not see multiple visitors from the same IP address aggregated into 1 visitor.