[Flaking Test] [sig-auth] integration-master TestMultiWebhookAuthzConfig

[pacoxu]

Which jobs are flaking?

• ci-kubernetes-integration-master

Which tests are flaking?

--- FAIL: TestMultiWebhookAuthzConfig (9.23s)
k8s.io/kubernetes/test/integration/auth.auth

Since when has it been flaking?

https://prow.k8s.io/view/gs/kubernetes-jenkins/logs/ci-kubernetes-integration-master/1770274294463467520
https://prow.k8s.io/view/gs/kubernetes-jenkins/logs/ci-kubernetes-integration-master/1773485209702895616 (03-20)

I cannot search for previous flake.

Testgrid link

https://testgrid.k8s.io/sig-release-master-blocking#integration-master

Reason for failure (if possible)

    authz_config_test.go:669: failure timestamp changed from reload1Metrics.reloadFailure 2024-03-28 23:27:10.466200351 +0000 UTC to 2024-03-28 23:27:10.953506469 +0000 UTC unexpectedly

Anything else we need to know?

https://github.com/kubernetes/kubernetes/blame/f4e246bc93ffb68b33ed67c7896c379efa4207e7/test/integration/auth/authz_config_test.go#L124
updated recently

Relevant SIG(s)

/sig auth
/cc @liggitt

[k8s-ci-robot]

This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[liggitt]

Updated the description, the actual cause of the flake is an unexpected change in the file reload timestamp metric

[liggitt]

interestingly, https://storage.googleapis.com/k8s-triage/index.html?pr=1&test=k8s.io%2Fkubernetes%2Ftest%2Fintegration%2Fauth.auth doesn't show any failures of this test for this reason (there are a few failures on a PR that broke a bunch of integration tests for a different reason)

[liggitt]

Fix open in #124111, switched the file write to an atomic write

[pacoxu]

Fix open in #124111, switched the file write to an atomic write

No flake after 03-29. Thanks.