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## Package org.apache.hadoop.metrics2.lib

Class Summary
AbstractMetricsSource | A convenient base class for writing metrics sources
MetricMutable | The mutable metric interface
MetricMutableCounter<T extends Number> | The mutable counter (monotonically increasing) metric interface
MetricMutableCounterInt | A mutable int counter for implementing metrics sources
MetricMutableCounterLong | A mutable long counter
MetricMutableFactory | Factory class for mutable metrics
MetricMutableGauge<T extends Number> | The mutable gauge metric interface
MetricMutableGaugeInt | A mutable int gauge
MetricMutableGaugeLong | A mutable long gauge
MetricMutableStat | A mutable metric with stats Useful for keep throughput/latency stats.
MetricsRegistry | An optional metrics registry class for creating and maintaining a collection of MetricsMutables, making writing metrics source easier.

Enum Summary
DefaultMetricsSystem | The default metrics system singleton

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