public MetricsMasterSource getMetricsSource() {
    return masterSource;
  }
This class is for maintaining the various master statistics and publishing them through the
metrics interfaces.
<p>
This class has a number of metrics variables that are publicly accessible; these variables
(objects) have methods to update their values.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MetricsMaster.java