@InterfaceAudience.Public @InterfaceStability.Evolving
| Class | Description | 
|---|---|
| DefaultMetricsSystemHelper | |
| DynamicMetricsRegistry | An optional metrics registry class for creating and maintaining a
 collection of MetricsMutables, making writing metrics source easier. | 
| MetricsExecutorImpl | Class to handle the ScheduledExecutorService ScheduledExecutorServiceused by
  MetricsRegionAggregateSourceImpl, and
  JmxCacheBuster | 
| MetricsExecutorImpl.ThreadPoolExecutorThreadFactory | |
| MutableFastCounter | |
| MutableHistogram | A histogram implementation that runs in constant space, and exports to hadoop2's metrics2 system. | 
| MutableRangeHistogram | Extended histogram implementation with metric range counters. | 
| MutableSizeHistogram | Extended histogram implementation with counters for metric size ranges. | 
| MutableTimeHistogram | Extended histogram implementation with counters for metric time ranges. | 
| Enum | Description | 
|---|---|
| MetricsExecutorImpl.ExecutorSingleton | 
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