Singlestat Panel - Native Plugin

The Singlestat Panel is included with Grafana.

The Singlestat Panel allows you to show the one main summary stat of a SINGLE series. It reduces the series into a single number (by looking at the max, min, average, or sum of values in the series). Singlestat also provides thresholds to color the stat or the Panel background. It can also translate the single number into a text value, and show a sparkline summary of the series.

Read more about it here:

http://docs.grafana.org/reference/singlestat/