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https://issues.apache.org/jira/browse/HDFS-12678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16217109#comment-16217109
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Elek, Marton commented on HDFS-12678:
-------------------------------------

I am not sure, but as I understood we need to import the NOTICE of the 
metrics-core library: 
https://github.com/dropwizard/metrics/blob/4.0-development/NOTICE

> Ozone: Corona: Add statistical information to json output
> ---------------------------------------------------------
>
>                 Key: HDFS-12678
>                 URL: https://issues.apache.org/jira/browse/HDFS-12678
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Lokesh Jain
>            Assignee: Lokesh Jain
>         Attachments: HDFS-12678-HDFS-7240.001.patch
>
>
> The Corona json output should contain statistical information like mean, 
> quantiles and standard deviation of time taken by ozone operations.



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