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As describe in https://github.com/kubernetes/enhancements/tree/master/keps/sig-instrumentation/2845-deprecate-klog-specific-flags-in-k8s-components, several klog flags will soon be removed from Kubernetes commands, in particular in the e2e test suites invoked by kubetest.
Right now that triggers a deprecation warning, for example in https://storage.googleapis.com/kubernetes-jenkins/logs/ci-crio-cgroupv1-node-e2e-conformance/1564520501156515840/build-log.txt