NetMeter allows to trouble-shoot performance problems by letting the user see network and CPU usage over time. On a mobile device, battery power is one of the most critical resources. Unexpected heavy network and CPU usage could be indicative power consuming background activities.
To allow monitoring while doing some other activity, NetMeter can keep running in the background while continuing to collect measurements. Whenever NetMeter is active, a small blue graph icon can be seen in the notification bar, by which it can always be launched again into the foreground. Use "stop" from the menu to close down NetMeter and stop the data collection. The "reset" menu option will reset the cumulative network usage counters in the tabular display part of the screen, without affecting the usage history graph. By default, the history graph shows the maximum amount of available data (max 24h) since NetMeter has been started. Use the "toggle scale" menu option to switch between shorter, more detailed views of the recent past.