"Visitor activity" shows in real time the current number of visitors and events taking place in the domains to which you have edit rights. The visitors are represented by the dark blue line and the events are represented by the light blue bars. On the left Y axis, the scale for the number of events is shown. On the right Y axis, the scale for the number of visitors is shown. At the bottom right part of the X axis, the present moment is shown and the event and visitor numbers for the last number of seconds flow from right to left. The activity is refreshed once per second. For example:
The scales for the Y axes are variable and depend on the total numbers that are being counted for the events and visitors.