Issue 1:
https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/pr-logs/pull/32163/kubernetes-pull-build-test-e2e-gce/57681/

Failed: [k8s.io] Kubectl client [k8s.io] Kubectl taint should remove all the taints with the same key off a node {Kubernetes e2e suite}

/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/kubectl.go:1306
Expected error:
<exec.CodeExitError>: {
Err: {
s: "error running &{/workspace/kubernetes/platforms/linux/amd64/kubectl [kubectl --server=https://104.198.216.32 --kubeconfig=/workspace/.kube/config taint nodes e2e-gce-agent-pr-50-0-master kubernetes.io/e2e-taint-key-d9a5a78b-751f-11e6-9eed-0242ac110002=testing-taint-value:NoSchedule] [] <nil> Error from server: client: etcd cluster is unavailable or misconfigured\n [] <nil> 0xc8208ce3a0 exit status 1 <nil> true [0xc820c28170 0xc820c28198 0xc820c281b0] [0xc820c28170 0xc820c28198 0xc820c281b0] [0xc820c28190 0xc820c281a8] [0xaec560 0xaec560] 0xc820bbdce0}:\nCommand stdout:\n\nstderr:\nError from server: client: etcd cluster is unavailable or misconfigured\n\nerror:\nexit status 1\n",
},
Code: 1,
}
error running &{/workspace/kubernetes/platforms/linux/amd64/kubectl [kubectl --server=https://104.198.216.32 --kubeconfig=/workspace/.kube/config taint nodes e2e-gce-agent-pr-50-0-master kubernetes.io/e2e-taint-key-d9a5a78b-751f-11e6-9eed-0242ac110002=testing-taint-value:NoSchedule] [] <nil> Error from server: client: etcd cluster is unavailable or misconfigured
[] <nil> 0xc8208ce3a0 exit status 1 <nil> true [0xc820c28170 0xc820c28198 0xc820c281b0] [0xc820c28170 0xc820c28198 0xc820c281b0] [0xc820c28190 0xc820c281a8] [0xaec560 0xaec560] 0xc820bbdce0}:
Command stdout:

stderr:
Error from server: client: etcd cluster is unavailable or misconfigured

error:
exit status 1

not to have occurred
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/framework/util.go:2156

Happened on a presubmit run in #32163.

Previous issues for this test: #31066 #31967

Issue 2:
https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/logs/kubernetes-e2e-gke/11756/

Failed: [k8s.io] Kubectl client [k8s.io] Kubectl taint should update the taint on a node {Kubernetes e2e suite}

/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/kubectl.go:1198
Expected error:
<*errors.errorString | 0xc820624710>: {
s: "Error running &{/workspace/kubernetes/platforms/linux/amd64/kubectl [kubectl --server=https://104.155.182.223 --kubeconfig=/workspace/.kube/config taint nodes gke-jenkins-e2e-default-pool-8f17ec09-iatl kubernetes.io/e2e-taint-key-498bd6c9-50a6-11e6-891a-0242ac110002-] [] <nil> failed to find client for version v1: error: google: could not find default credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.\n [] <nil> 0xc82077efc0 exit status 1 <nil> true [0xc820796328 0xc820796340 0xc820796358] [0xc820796328 0xc820796340 0xc820796358] [0xc820796338 0xc820796350] [0xaaeb60 0xaaeb60] 0xc820c722a0}:\nCommand stdout:\n\nstderr:\nfailed to find client for version v1: error: google: could not find default credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.\n\nerror:\nexit status 1\n",
}
Error running &{/workspace/kubernetes/platforms/linux/amd64/kubectl [kubectl --server=https://104.155.182.223 --kubeconfig=/workspace/.kube/config taint nodes gke-jenkins-e2e-default-pool-8f17ec09-iatl kubernetes.io/e2e-taint-key-498bd6c9-50a6-11e6-891a-0242ac110002-] [] <nil> failed to find client for version v1: error: google: could not find default credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
[] <nil> 0xc82077efc0 exit status 1 <nil> true [0xc820796328 0xc820796340 0xc820796358] [0xc820796328 0xc820796340 0xc820796358] [0xc820796338 0xc820796350] [0xaaeb60 0xaaeb60] 0xc820c722a0}:
Command stdout:

stderr:
failed to find client for version v1: error: google: could not find default credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.

error:
exit status 1

not to have occurred

Previous issues for this test: #27976