Flaky e2e test: StatefulSet integration when StatefulSet created should admit group that fits

[mimowo]

What happened:

e2e failed on unrelated branch: https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kueue/4341/pull-kueue-test-e2e-main-1-31/1896970322809196544

What you expected to happen:

no random failures

How to reproduce it (as minimally and precisely as possible):

run ci

Anything else we need to know?:

Actually 3 tests failed, which might be related:

End To End Suite: kindest/node:v1.31.0: [It] StatefulSet integration when StatefulSet created should admit group that fits expand_less	1m8s
{Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/util/util.go:104 with:
Error matcher expects an error.  Got:
    <nil>: nil failed [FAILED] Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/util/util.go:104 with:
Error matcher expects an error.  Got:
    <nil>: nil
In [It] at: /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:133 @ 03/04/25 17:19:52.185
}
[open stderropen_in_new](https://prow.k8s.io/spyglass/lens/junit/iframe?req=%7B%22artifacts%22%3A%5B%22artifacts%2Frun-test-e2e-singlecluster-1.31.0%2Fjunit.xml%22%5D%2C%22index%22%3A2%2C%22src%22%3A%22gs%2Fkubernetes-ci-logs%2Fpr-logs%2Fpull%2Fkubernetes-sigs_kueue%2F4341%2Fpull-kueue-test-e2e-main-1-31%2F1896970322809196544%22%7D&topURL=https%3A//prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kueue/4341/pull-kueue-test-e2e-main-1-31/1896970322809196544&lensIndex=2#)
End To End Suite: kindest/node:v1.31.0: [It] StatefulSet integration when StatefulSet created should allow to update the PodTemplate in StatefulSet expand_less	1m7s
{Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:180 with:
Expected
    <string>: "...t:2.52@sha2..."
to equal               |
    <string>: "...t:2.53@sha2..." failed [FAILED] Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:180 with:
Expected
    <string>: "...t:2.52@sha2..."
to equal               |
    <string>: "...t:2.53@sha2..."
In [It] at: /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:182 @ 03/04/25 17:20:59.406
}
[open stderropen_in_new](https://prow.k8s.io/spyglass/lens/junit/iframe?req=%7B%22artifacts%22%3A%5B%22artifacts%2Frun-test-e2e-singlecluster-1.31.0%2Fjunit.xml%22%5D%2C%22index%22%3A2%2C%22src%22%3A%22gs%2Fkubernetes-ci-logs%2Fpr-logs%2Fpull%2Fkubernetes-sigs_kueue%2F4341%2Fpull-kueue-test-e2e-main-1-31%2F1896970322809196544%22%7D&topURL=https%3A//prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kueue/4341/pull-kueue-test-e2e-main-1-31/1896970322809196544&lensIndex=2#)
End To End Suite: kindest/node:v1.31.0: [It] StatefulSet integration when StatefulSet created should delete all pods on scale down to zero expand_less	1m1s
{Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:233 with:
Expected
    <int32>: 2
to equal
    <int32>: 0 failed [FAILED] Timed out after 45.001s.
The function passed to Eventually failed at /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:233 with:
Expected
    <int32>: 2
to equal
    <int32>: 0
In [It] at: /home/prow/go/src/sigs.k8s.io/kueue/test/e2e/singlecluster/statefulset_test.go:234 @ 03/04/25 17:22:00.465
}

Environment:

• Kubernetes version (use kubectl version):
• Kueue version (use git describe --tags --dirty --always):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[mimowo]

cc @mbobrovskyi @mszadkow @nasedil

[mimowo]

/kind flake

[mimowo]

Another occurrence: https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kueue/4503/pull-kueue-test-e2e-main-1-30/1897973595200557056