def gauge(name, callable = nil, &block)
      add_or_get(name, Metriks::Gauge) do
        Metriks::Gauge.new(callable, &block)
      end
    end
def gauge(name, callable = nil, &block)
      add_or_get(name, Metriks::Gauge) do
        Metriks::Gauge.new(callable, &block)
      end
    end
Public: Fetch or create a new gauge metric.

 name - The String name of the metric to define or fetch

 Examples

   registry.gauge('disk_space.used') { 1 }

 Returns the Metriks::Gauge identified by the name.