@ModuleOption("smoothing constant, or -1 to use arithmetic mean")
	public void setAlpha(double alpha) {
		this.alpha = alpha;
	}
Captures options for the {@code rich-gauge} sink module.

@author Eric Bottard
spring-xd-analytics/src/main/java/org/springframework/xd/analytics/metrics/metadata/RichGaugeSinkOptionsMetadata.java