For each view in the Statistics subtab of the Health tab, the standard toolbar items include:
View: Controls the columns to display, and the sort order of columns.
Refresh Interval: Sets the interval between which the statistics are refreshed. Select 30 seconds, 1, 2, 5 or 10 minutes. The default setting is 5 minutes.
Refresh Now: The icon refreshes the statistical information.
Line Graph: The icon opens a dialog containing a line graph view of the statistics as they are refreshed. This is available in all views, except the Server Pools Folder view.