Thanks a lot Jesse for the explanation. I wasn't enough specific on the 
"why does the builds were started almost everyday", your explanation is 
what we understood, but using the crystal clear words :heart:

By the way, the setting "Ignore rebuilding merge branches when only the 
target branch changed" had been applied to the organization scanning folder 
named "Tools", which include the BOM project. If it does not cause any harm 
in the next 7 days, we'll apply this to all the top level items on 
ci.jenkins.io.

Thanks y'all for the feedbacks.

Damien

Le mardi 23 novembre 2021 à 21:19:28 UTC+1, Jesse Glick a écrit :

> On Tue, Nov 23, 2021 at 2:32 PM Damien Duportal <[email protected]> 
> wrote:
>
>> As part of reducing the infrastructure costs, we would like to stop 
>> triggering builds of the pull requests on the BOM project when the target 
>> branch is updated (as suggested in 
>> https://issues.jenkins.io/browse/INFRA-1633 if I'm correct).
>>
>
> Correct. I would recommend this change be made to *all* multibranch 
> projects on the site, but certainly heavyweight repos like `bom` are the 
> first priority.
>
> The rationale is that each daily organization scanning triggers a bunch of 
>> builds on this repository
>>
>
> No, assuming webhooks have not been lost, scanning per se should not 
> trigger builds. Rather the problem is that a PR is merged, advancing the 
> base branch, and then every remaining open PR is rebuilt against that new 
> head.
>
> if an author of a pull request want their build to kick off, then they 
>> have to update their source branch.
>>
>
> Yes, fine.
>

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