T - the type of the metric's valuepublic interface Gauge<T> extends Metric
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();
}
};
一种实时数据的度量,反映的是瞬态的数据,不具有累加性。
具体的实现由具体定义,例如,获取当前jvm的活跃线程数
T getValue()
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