public MutableRate newRate(String name, String desc, boolean extended) {
    return newRate(name, desc, extended, true);
  }
Create a mutable rate metric (for throughput measurement)
@param name     of the metric
@param desc     description
@param extended produce extended stat (stdev/min/max etc.) if true
@return a new mutable rate metric object
hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/DynamicMetricsRegistry.java