| Package | Description | 
|---|---|
| org.apache.hadoop.metrics2.lib | A collection of library classes for implementing metrics sources | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | MutableCounterThe mutable counter (monotonically increasing) metric interface | 
| class  | MutableCounterIntA mutable int counter for implementing metrics sources | 
| class  | MutableCounterLongA mutable long counter | 
| class  | MutableGaugeThe mutable gauge metric interface | 
| class  | MutableGaugeIntA mutable int gauge | 
| class  | MutableGaugeLongA mutable long gauge | 
| class  | MutableQuantilesWatches a stream of long values, maintaining online estimates of specific
 quantiles with provably low error bounds. | 
| class  | MutableRateA convenient mutable metric for throughput measurement | 
| class  | MutableRatesHelper class to manage a group of mutable rate metrics
 This class synchronizes all accesses to the metrics it
 contains, so it should not be used in situations where
 there is high contention on the metrics. | 
| class  | MutableRatesWithAggregationHelper class to manage a group of mutable rate metrics. | 
| class  | MutableRollingAverages
 This class maintains a group of rolling average metrics. | 
| class  | MutableStatA mutable metric with stats. | 
| Modifier and Type | Method and Description | 
|---|---|
| MutableMetric | MetricsRegistry. get(String name)Get a metric by name | 
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