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https://issues.jenkins-ci.org/browse/JENKINS-12126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=163661#comment-163661
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nealeu commented on JENKINS-12126:
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I've found the same problem. 

This could be an option.

Another useful option on the existing implementation would be to make the 
vertical axis a logarithmic scale (it would have to be number of log(n+1) so 
that log of 0 failures is not minus infinity).

Under these circumstances, 1 test failures out of 1000 would occupy 10% of the 
vertical scale (log 1000/log (1+1))


                
> Test Trend Chart should be able to show only the failures
> ---------------------------------------------------------
>
>                 Key: JENKINS-12126
>                 URL: https://issues.jenkins-ci.org/browse/JENKINS-12126
>             Project: Jenkins
>          Issue Type: New Feature
>          Components: dashboard-view
>            Reporter: Jean-Marc Bourguet
>            Assignee: Marco Ambu
>
> The test trend chart in the dashboard view is showing both the number of 
> tests and the number of failures. When you have a big number of tests and few 
> failures, the later aren't visible enough while they are what is important.
> The test trend chart in the job can be switched to show a graph of only the 
> failure number.  A similar graph in the dashboard view would be more useful 
> to me than the current one.

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