Merge pull request #1091 from kubernetes/revert-974-skip-ext4-e2e

Revert "Skip ext4 e2e tests"

Author: k8s-ci-robot

test/e2e/metriconly/metrics_test.go

@@ -130,7 +130,6 @@ var _ = ginkgo.Describe("NPD should export Prometheus metrics.", func() {
 		})
 
 		ginkgo.It("NPD should update problem_counter{reason:Ext4Error} and problem_gauge{type:ReadonlyFilesystem}", func() {
-			ginkgo.Skip("Writing to /sys/fs/ext4/sda1/trigger_fs_error breaks SSH: https://github.com/kubernetes/node-problem-detector/issues/970")
 			time.Sleep(5 * time.Second)
 			assertMetricValueAtLeast(instance,
 				"problem_counter", map[string]string{"reason": "Ext4Error"},
@@ -141,7 +140,6 @@ var _ = ginkgo.Describe("NPD should export Prometheus metrics.", func() {
 		})
 
 		ginkgo.It("NPD should remain healthy", func() {
-			ginkgo.Skip("Writing to /sys/fs/ext4/sda1/trigger_fs_error breaks SSH: https://github.com/kubernetes/node-problem-detector/issues/970")
 			npdStates := instance.RunCommandOrFail("sudo systemctl show node-problem-detector -p ActiveState -p SubState")
 			Expect(npdStates.Stdout).To(ContainSubstring("ActiveState=active"), "NPD is no longer active: %v", npdStates)
 			Expect(npdStates.Stdout).To(ContainSubstring("SubState=running"), "NPD is no longer running: %v", npdStates)