Project: springxd
Issue XD-176: Support exponential moving average in RichGauge 
This could easily be supported in the existing gauge by adding a setAlpha method to RichGaugeService and adding the extra parameter "alpha" to the gauge data (https://en.wikipedia.org/wiki/Exponential_moving_average). If not set it would default to the current behaviour (simple mean), otherwise it would calculate the exponential moving average in place of the mean.
Story points: 2