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The metrics library for Apache Dubbo and any frameworks or systems.

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在使用metrics.log的时候发现有些行中打印了多个metrics的日志,这样做日志统计时会丢失数据。 如下: ![image](https://user-images.githubusercontent.com/1171688/55456879-c4a81900-561a-11e9-88af-0c41c7872274.png) 版本信息: metrics-core-api 1.7.9 pandora 2019-03-release-hsf-bugfix (内置1.7.9的实现) springframework 4.3.21

timer中能否添加一分钟内出现错误的次数统计? 这样的话 我就只需要用一个timer 就可以统计出我所需要的数据了 统计错误次数的原因是 方便监控以及预警

question

The following flame graph shows the memory allocation is beyond expectation. We should optimize it. ![image](https://user-images.githubusercontent.com/4397305/54897151-2f15d680-4f02-11e9-8a64-bdfdb63c913d.png)

问题:我在测试的时候 针对1个接口在1分钟之内调用了10次,从这一分钟过后就在也没有调用过 但是后续的打印结果里 m1 m5 m15的值是非0.0 我理解应该是0.0才对 ![image](https://user-images.githubusercontent.com/16012082/54576554-ae536800-4a33-11e9-848b-55ba40f5eb35.png)

question

Ensure the metrics can be exported to Spring micrometer.

A java application running under spring boot: ``` 2019-03-14 11:46:07.202 ERROR 20364 --- [rter-1-thread-1] com.alibaba.metrics.tomcat.HttpGaugeSet : Exception occur when getting connector global stats: java.lang.NullPointerException: null at com.alibaba.metrics.tomcat.HttpGaugeSet.getValueInternal(HttpGaugeSet.java:87) at com.alibaba.metrics.CachedMetricSet.refreshIfNecessary(CachedMetricSet.java:48) at...

When calculating cluster histogram, it is usually difficult to config the correct bucket for the first time, we should provide a HTTP endpoint to update the buckets dynamically.