Metrics.NET（https://github.com/danielcrenna/metrics-net）是一个给CLR
提供度量工具的包，它是移植自Java的metrics，在c#代码中嵌入Metrics代码，可以方便的对业务代码的各个指标进行监控,
提供5种度量的类型：Gauges, Counters, Histograms,
Meters,Timers：
- Gauges are instantaneous readings of values (e.g., a
queue depth).
- Counters are 64-bit integers which can be incremented or
decremented.
- Meters are increment-only counters which keep track of
the rate of events. They provide mean rates, plus exponentially-weighted
moving averages which use the same formula that the UNIX 1-, 5-, and 15-minute
load averages use.
- Histograms capture distribution measurements about a
metric: the count, maximum, minimum, mean, standard deviation, median, 75th
percentile, 95th percentile, 98th percentile, 99th percentile, and 99.9th
percentile of the recorded values. (They do so using a method called reservoir
sampling which allows them to efficiently keep a small, statistically
representative sample of all the measurements.)
- Timers record the duration as well as the rate of events.
In addition to the rate information that meters provide, timers also provide
the same metrics as histograms about the recorded durations. (The samples that
timers keep in order to calculate percentiles and such are biased towards more
recent data, since you probably care more about how your application is doing
now as opposed to how it‘s done historically.)
HBase
Metrics机制分析与架构总结
JAVA
Metrics度量工具 - Metrics Core 翻译
Metrics.NET 项目
原文：http://www.cnblogs.com/shanyou/p/3541971.html
