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Like all other metrics, each label combination is its own data-point and is incremented individually.The best practice on naming counters is to using the.The absolute value of a counter is pretty irrelevant and should not be relied on - this is because counters do not preserve their value over application restarts.

In most scenarios, the,The graph aboves highlights how important distribution is to understand a metric like latency.

rolling-updates, auto-scaling…), therefore counters will very often reset back to 0.The real purpose of counters is actually in their evolution over time, which can be obtained through functions like.Example of a requests counter (total and rate):Not all application metrics can be covered by counters, as they might go up and down over time. Search for other Market Research & Analysis in Ann Arbor on The Real Yellow Pages®. 1.在 Kafka Broker 外部, 作为一个独立进程, 通过 JMX 的 RMI 接口读取数据. irate和rate都会用于计算某个指标在一定时间间隔内的变化速率。但是它们的计算方法有所不同：irate取的是在指定时间范围内的最近两个数据点来算速率，而rate会取指定时间范围内所有数据点，算出一组速率，然后取平均值作为结果。 所以官网文档说：irate适合快速变化的计数器（counter），而rate适合缓慢变化的计数器（counter）。 根据以上算法我们也可以理解，对于快速变化的计数器，如果使用rate，因为使用了平均值，很容易把峰值削平。除非我们把时间间 … If we imagine that this metric has an,In practice, a Histogram will result in the creation of an additional metric (with the.Keeping in mind that each unique combination of labels is considered as a separate time-series, it is usually good practice to keep the number of buckets small, as well as the number of other labels on Histograms.Summaries have the advantage of being more accurate for the pre-defined quantiles, however the client-side calculation can be expensive to do (while Histograms are basically just counters). Histograms make this simpler by sampling the observations in a pre-defined,When creating an Histogram, it is important to think about what the buckets should be from the beginning.

Averages unfortunately have the big drawback of hiding distribution and prevent the discovery of outliers.Quantiles are better measurement for this kind of metrics, as they allow to understand distribution. irate() 这种方式的好处是有任何调整不需要重启 Kafka Broker 进程, 缺点是多维护了一个独立的进程。 Introduction 2.