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https://issues.apache.org/jira/browse/HADOOP-12561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995161#comment-14995161
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Steve Loughran commented on HADOOP-12561:
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It's mostly covered in the javadocs, stuff a metrics.md shouldn't duplicate.
Whatever is added, it should just cross-ref to the current javadocs for the
low-level bits
> Add documentation about metrics system
> --------------------------------------
>
> Key: HADOOP-12561
> URL: https://issues.apache.org/jira/browse/HADOOP-12561
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
>
> Though there is [reference of metric
> items|https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-common/Metrics.html],
> we have no documentation about metrics system and configuration. Adding
> concise documentation about metrics system would help users, admins and
> developers.
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