I this a general advice or are you using the warnings plugin in a different way 
that requires that the old behavior should be retained?

BTW: the corresponding issue is 
https://issues.jenkins-ci.org/browse/JENKINS-50551

> Am 05.04.2018 um 13:13 schrieb Artur Szostak <aszos...@partner.eso.org>:
> 
> Unless you want to make a lot of people angry, or unless there is a 
> fundamentally good reason, always make the existing behaviour the default. 
> New behaviour should be explicitly selected. If there is a good reason to 
> make new behaviour the default, there should at the very least be a 
> transition period over several plugin versions, and clear deprecation 
> warnings / mechanisms to allow for a sensible update / transition strategy.
> 
> Cheers
> 
> Artur
> ________________________________________
> From: jenkinsci-users@googlegroups.com 
> <mailto:jenkinsci-users@googlegroups.com> <jenkinsci-users@googlegroups.com 
> <mailto:jenkinsci-users@googlegroups.com>> on behalf of Dan 
> <daniel.faie...@remcom.com <mailto:daniel.faie...@remcom.com>>
> Sent: 30 March 2018 15:29:25
> To: Jenkins Users
> Subject: Re: Trend Graph
> 
> Maybe I should change that so that the first build always has no new 
> warnings. What do you think? I’m not sure if I break something from other 
> peoples’ jobs if I change that…
> 
> This would solve my problem, so I'm all for it!
> For people who want existing functionality, you could add a checkbox in 
> "Configure the trend graph". Although it seems my usage makes more sense, 
> there's probably someone who disagrees. Something like:
> 
> 
> Suppress reference build
> If set warnings for the reference build are not displayed as 'new' for the 
> graph type 'Distribution of new and fixed warnings'.
> 
> 
> 
> Or you could reverse it and have
> 
> Display reference build
> 
> 
> On Thursday, March 29, 2018 at 7:43:19 PM UTC-4, Ullrich Hafner wrote:
> I think this will not work. If no previous result is found, then an empty set 
> of warnings is used as baseline, so we still get a large number of new 
> warnings. I wonder if it would make sense to change the current behavior of 
> my plugin. I must admit that marking all warnings of the first build as new 
> is not a conscious decision. Maybe I should change that so that the first 
> build always has no new warnings. What do you think? I’m not sure if I break 
> something from other peoples’ jobs if I change that…
> 
> The other suggestions about changing the graphs: this is currently not 
> supported will will never be supported with the current chart implementation. 
> In the future (*), I would like to replace the png server side rendered 
> charts with client side rendered JS charts. Then it should be easy to 
> configure these graphs on the client side.
> 
> (*) Currently this is blocked by an integration of an old Prototype.JS 
> library in Jenkins core, see 
> https://issues.jenkins-ci.org/browse/JENKINS-49319 for details
> 
> Am 29.03.2018 um 21:42 schrieb Mark Waite <mark.ea...@gmail.com 
> <http://gmail.com/><javascript:>>:
> 
> What if the first build on a branch were run without calculating warnings 
> (since you intend to ignore warnings from the first build, you could choose 
> not to compute those warnings and not to report them.
> 
> After first build is complete, reconfigure the job (Jenkins UI or in the 
> Jenkinsfile if Pipeline) to report warnings.
> 
> Mark Waite
> 
> On Thu, Mar 29, 2018 at 12:26 PM Dan <daniel....@remcom.com 
> <http://remcom.com/><javascript:>> wrote:
> Jenkins uses a trend graph to display things like failed unit tests or 
> compilation warnings as a function of build number. Is there a way to 
> suppress only the first build OR to limit the height of the y-axis?
> 
> My company's workflow
> - create a copy of a Jenkins job for your particular branch
> - Build the branch without changes. This gives a baseline for the # of 
> warnings in the code (it has very old code, so there are a LOT)
> - The branch then automatically builds daily. New warnings introduced by the 
> developer show up in the Trend Graph.
> 
> The Trend Graph is configured to show only new or fixed warnings.
> The problem is that the 1st build introduces a ton of "new" warnings. This 
> pushes the +Y-axis max value to >1000. Any warnings fixed/introduced after 
> that are not visible.
> 
> Solution
> If we could somehow suppress showing just that first build, while still 
> showing all subsequent builds, this would be fixed. Or, if the +Y-axis could 
> be limited to show numbers from 0-100, this would be fixed.
> 
> Is this possible?
> 
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