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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.

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package com.codahale.metrics;


/**
 * A gauge metric is an instantaneous reading of a particular value. To instrument a queue's depth,
 * for example:

 * 
 * final Queue<String> queue = new ConcurrentLinkedQueue<String>();
 * final Gauge<Integer> queueDepth = new Gauge<Integer>() {
 *     public Integer getValue() {
 *         return queue.size();
 *     }
 * };
 * 
 *
 * @param  the type of the metric's value
 */
@FunctionalInterface
public interface Gauge extends Metric {
    /**
     * Returns the metric's current value.
     *
     * @return the metric's current value
     */
    T getValue();
}