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https://issues.apache.org/jira/browse/CHUKWA-262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713326#action_12713326
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Ari Rabkin commented on CHUKWA-262:
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This may be invalid. Does the "host" field do that?

> keep number of measurements in cluster_ tables
> ----------------------------------------------
>
>                 Key: CHUKWA-262
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-262
>             Project: Hadoop Chukwa
>          Issue Type: New Feature
>          Components: Data Processors
>            Reporter: Ari Rabkin
>             Fix For: 0.2.0
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> When we compute an average across a number of machines, it would be good to 
> keep track of the number of machines in question. This will alert the user if 
> shifts in the average are due to shifts on a bunch of machines, or shifts in 
> which machines are reporting.

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