## 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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