Honor stderrthreshold when logtostderr is enabled

[pierluigilenoci]

Summary

Opt into the new klog behavior so that -stderrthreshold is honored even when -logtostderr=true (the default). Set stderrthreshold=INFO to preserve backward compatibility.

Background

When -logtostderr=true, -stderrthreshold was ignored — all logs went to stderr. Fixed in kubernetes/klog#432 (v2.140.0+), but projects must opt in.

References

• stderrthreshold not honored when logtostderr is set klog#212
• feat: fix stderrthreshold not honored when logtostderr is set (#212) + two new flags klog#432

Honor stderrthreshold when logtostderr is enabled

[pierluigilenoci]

Hi @Random-Liu, @hakman, @wangzhen127 — would you be willing to review? Thank you!

[hakman]

Thanks for the PR @pierluigilenoci! 🙂
/lgtm
/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman, pierluigilenoci

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[hakman]

/override pull-npd-e2e-test

[k8s-ci-robot]

@hakman: Overrode contexts on behalf of hakman: pull-npd-e2e-test

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/override pull-npd-e2e-test

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