When you start recording a test case from a web browser or mobile device, StresStimulus automatically groups the recorded requests into pages (a) using a heuristic algorithm. Pages are essential elements of the test, and StresStimulus collects and reports page performance metrics in addition to request performance metrics. In some cases, requests may not be associated with any page. These requests will be left ungrouped.
You can disable automatic page breakdown. To do so, in the Test Wizard -> Record Test Case step, un-checked the Group requests into pages box. This can be helpful when, instead of tracking the performance of pages, you prefer to track performance of transactions which can be used to group requests manually. Disabling pages is also helpful when testing Web services.