[HDFS-13674] Improve documentation on Metrics

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.1.1
• Component/s: documentation, metrics
• Hadoop Flags: Reviewed
• Assignee: Chao Sun
• Reporter: Chao Sun
• Created: 13/Jun/18 22:39
• Updated: 09/Jul/18 18:21
• Resolved: 09/Jul/18 06:32

Description

There are a few confusing places in the Hadoop Metrics page. For instance, there are duplicated entries such as FsImageLoadTime; some quantile metrics do not have corresponding entries, description on some quantile metrics are not very specific on what is the num variable in the metrics name, etc.

This JIRA targets at improving this.