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[MNT]: ci: ubuntu-20.04 GitHub Actions runner will soon be unmaintained #29766

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jayaddison opened this issue Mar 18, 2025 · 5 comments · Fixed by #29796
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[MNT]: ci: ubuntu-20.04 GitHub Actions runner will soon be unmaintained #29766

jayaddison opened this issue Mar 18, 2025 · 5 comments · Fixed by #29796
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Maintenance
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v3.10.3

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@jayaddison
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Summary

The ubuntu-20.04 GitHub Actions runner image, currently used in the tests.yml workflow will soon be unsupported, as notified at: actions/runner-images#11101

Proposed fix

Ubuntu 20.04 itself is a long-term-support release, however it is also nearing the end of that support cycle, and will no longer be supported by Canonical from May 2025: https://ubuntu.com/20-04

I'd suggest removing the ubuntu-20.04 jobs from the tests.yml workflows at the end of this month (March 2025).
@timhoffm
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Thanks for the reminder.

We have two runners with ubuntu-20.04:

  • matplotlib/.github/workflows/tests.yml

    Lines 60 to 61 in 3edda65

    - os: ubuntu-20.04
    python-version: '3.10'

    Per our policy, we're supporting minor Python versions that are released in the last 42 months. For Python 3.10 this means we can officially drop support on Apr. 10. Given that I don't think we'll release until then, I'm ok with simply removing this job, even though we formally have a short untested period for 3.10.

  • matplotlib/.github/workflows/tests.yml

    Lines 50 to 52 in 3edda65

    - name-suffix: "(Minimum Versions)"
    os: ubuntu-20.04
    python-version: '3.10'

    We still want a min-version check. This should be moved to ubuntu-22.04 and python 3.11.

@jayaddison
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Per our policy, we're supporting minor Python versions that are released in the last 42 months. For Python 3.10 this means we can officially drop support on Apr. 10. Given that I don't think we'll release until then, I'm ok with simply removing this job, even though we formally have a short untested period for 3.10.

That job does seem to test one or two other factors: disabling link-time optimization, and something to do with matplotlib-inline. Perhaps I could try updating it to use ubuntu-22.04 (or even ubuntu-24.04) instead, to continue to exercise those?

@timhoffm
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You're right. This does more and shouldn't be removed without replacement.

matplotlib-inline: The backend mapping was moved from IPython to matplotlib, see #27948. The test ensures that newer matplotlib versions still work with older ipython. This specific addition is tremporary, but I agree that it's too early to drop it. However, it's in a similar spirit as "Minimum versions", I therefore suggest to move this into requirements/testing/minver.txt and test it with that job.

The no-lto can be moved to the regular python 3.11 job.

@tacaswell tacaswell added this to the v3.10.2 milestone Mar 18, 2025
@tacaswell
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Normally we don't backport CI changes, but given that these jobs are going away we should drag this back to atleast the 3.10.x branch.

@tacaswell
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On second thought, we can not just straight backport it as we still should test py3.10 on mpl3.10.x

@timhoffm timhoffm mentioned this issue Mar 18, 2025
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@tacaswell @timhoffm @jayaddison