Hey Nir,
It's actually happening because of centos 7.6 mirrors were deleted today.
I've proposed [1] to fix it.

[1]: https://gerrit.ovirt.org/#/c/103601/

On Thu, Sep 26, 2019 at 4:59 PM Nir Soffer <nsof...@redhat.com> wrote:

> On Thu, Sep 26, 2019 at 3:55 PM oVirt Jenkins <jenk...@ovirt.org> wrote:
>
>> Change 103548,1 (vdsm) is probably the reason behind recent system test
>> failures in the "ovirt-4.3" change queue and needs to be fixed.
>>
>> This change had been removed from the testing queue. Artifacts build from
>> this
>> change will not be released until it is fixed.
>>
>
> This is a bug in the change queue, because
>
> For further details about the change see:
>> https://gerrit.ovirt.org/#/c/103548/1
>
>
> this is a travis configuration change, and it cannot break system tests :-)
>
> Do we have stats of such failures in the past?
>
> For failed test results see:
>> http://jenkins.ovirt.org/job/ovirt-4.3_change-queue-tester/2188/
>
>
> Maybe we can add a simple file based condition to tell if a patch need to
> run
> system tests?
>
> For example in vdsm we have this structure:
> lib/
> static/
> tests/
> automation/
> .travis.ymal
> ...
>
> Changes in tests/ and automation/ cannot break vdsm during runtime, so
> there
> is no need to run system tests for patches modifying these directories.
>
> Here are changes stats per directory since 4.2:
>
> $ git shortlog -sn --since v4.20.0 ./tests ./automation | awk '{sum+=$1}
> END {print sum}'
> 4579
> $ git shortlog -sn --since v4.20.0 ./lib ./static | awk '{sum+=$1} END
> {print sum}'
> 4413
>
> So 50% of the changes cannot break the system and do not require system
> tests.
>
> SLOC Directory SLOC-by-Language (Sorted)
> 65205   lib             python=64977,sh=228
> 62415   tests           python=62317,sh=98
> 3432    vdsm_hooks      python=3432
> 803     contrib         python=740,sh=63
> 468     automation      sh=454,python=14
> 313     static          python=210,sh=103
> 289     init            sh=162,python=127
> 112     build-aux       sh=72,python=40
> 64      top_dir         sh=64
> 30      doc             python=30
> 30      helpers         python=30
> 1       vdsm_log        sh=1
> 0       docker          (none)
> 0       m4              (none)
>
> We can see that the tests are about 50% of the code. This is pretty good
> for legacy
> project, but if we look in a more modern project like ovirt-imageio:
>
> common:
> SLOC Directory SLOC-by-Language (Sorted)
> 3641    test            python=3641
> 2365    ovirt_imageio_common python=2201,ansic=164
> 103     top_dir         python=103
>
> daemon:
> SLOC Directory SLOC-by-Language (Sorted)
> 1588    test            python=1588
> 792     ovirt_imageio_daemon python=792
> 18      top_dir         python=18
> 0       data            (none)
>
> We see that test code ratio is close to 2/1.
>
> So adding a filter per project that can tell if a patch needs system tests
> very important,
> and can speed our workflow by fact of 2-3.
>
> Adding infra-support to file a bug, we need to work on this.
>
> Nir
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