How to use

tag

method

in

org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueueMetrics

public synchronized 
static FSQueueMetrics forQueue(String queueName, Queue parent,
  boolean enableUserMetrics, Configuration conf) {
 MetricsSystem ms = DefaultMetricsSystem.instance();
 QueueMetrics metrics = queueMetrics.get(queueName);
 if (metrics == null) {
  metrics = new FSQueueMetrics(ms, queueName, parent, enableUserMetrics, conf)
    .tag(QUEUE_INFO, queueName);
  
  // Register with the MetricsSystems
  if (ms != null) {
   metrics = ms.register(
       sourceName(queueName).toString(), 
       "Metrics for queue: " + queueName, metrics);
  }
  queueMetrics.put(queueName, metrics);
 }
 return (FSQueueMetrics)metrics;
}

public synchronized 
static FSQueueMetrics forQueue(String queueName, Queue parent,
  boolean enableUserMetrics, Configuration conf) {
 MetricsSystem ms = DefaultMetricsSystem.instance();
 QueueMetrics metrics = queueMetrics.get(queueName);
 if (metrics == null) {
  metrics = new FSQueueMetrics(ms, queueName, parent, enableUserMetrics, conf)
    .tag(QUEUE_INFO, queueName);
  
  // Register with the MetricsSystems
  if (ms != null) {
   metrics = ms.register(
       sourceName(queueName).toString(), 
       "Metrics for queue: " + queueName, metrics);
  }
  queueMetrics.put(queueName, metrics);
 }
 return (FSQueueMetrics)metrics;
}

if (metrics == null) {
 metrics = new FSQueueMetrics(ms, queueName, parent, enableUserMetrics, conf)
   .tag(QUEUE_INFO, queueName);