http://metrics.dropwizard.io/metrics-core: Metrics is a Java library which gives you unparalleled insight into what your code does in production. Metrics provides a powerful toolkit of ways to measure the behavior of critical components in your production environment.
  • Coda Hale
  • Ryan Tenney
  • Artem Prigoda 
public interface com.codahale.metrics.Gauge<T> extends com.codahale.metrics.Metric
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.codahale.metrics.Gauge
  super_class: java.lang.Object
{
  public abstract T getValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()TT;
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Lcom/codahale/metrics/Metric;
SourceFile: "Gauge.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()