Gauges are constant until overwritten, and not reset at flush time.

The statsd documentation says (http://statsd.readthedocs.org/en/v1.0.0/types.html):

"Gauges are a constant data type. They are not subject to averaging, and they don't change unless you change them. That is, once you set a gauge value, it will be a flat line on the graph until you change it again."

Bucky resets the gauge at flush time.  My patch restores etsy statsd behavior.