e2e: restore the test for monotonically increasing restart count

hack/jenkins/e2e.sh

@@ -119,7 +119,6 @@ GCE_FLAKY_TESTS=(
     "DaemonRestart"
     "Daemon\sset\sshould\slaunch\sa\sdaemon\spod\son\severy\snode\sof\sthe\scluster"
     "Resource\susage\sof\ssystem\scontainers"
-    "monotonically\sincreasing\srestart\scount"
     "should\sbe\sable\sto\schange\sthe\stype\sand\snodeport\ssettings\sof\sa\sservice" # file: service.go, issue: #13032
     "allows\sscheduling\sof\spods\son\sa\sminion\safter\sit\srejoins\sthe\scluster" # file: resize_nodes.go, issue: #13258
     "should\srelease\sthe\sload\sbalancer\swhen\sType\sgoes\sfrom\sLoadBalancer" # timeouts in 20 minutes in last builds. #14424
@@ -137,6 +136,7 @@ GCE_SLOW_TESTS=(
     "SchedulerPredicates\svalidates\sMaxPods\slimit " # 8 min,        file: scheduler_predicates.go, PR:    #13315
     "Nodes\sResize"                                   # 3 min 30 sec, file: resize_nodes.go,         issue: #13323
     "resource\susage\stracking"                       # 1 hour,       file: kubelet_perf.go,         slow by design
+    "monotonically\sincreasing\srestart\scount"       # 1.5 to 5 min, file: pods.go,                 slow by design
     )
 
 # Tests which are not able to be run in parallel.

test/e2e/pods.go

@@ -35,7 +35,11 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-func runLivenessTest(c *client.Client, ns string, podDescr *api.Pod, expectNumRestarts int) {
+const (
+	defaultObservationTimeout = time.Minute * 2
+)
+
+func runLivenessTest(c *client.Client, ns string, podDescr *api.Pod, expectNumRestarts int, timeout time.Duration) {
 	By(fmt.Sprintf("Creating pod %s in namespace %s", podDescr.Name, ns))
 	_, err := c.Pods(ns).Create(podDescr)
 	expectNoError(err, fmt.Sprintf("creating pod %s", podDescr.Name))
@@ -61,7 +65,7 @@ func runLivenessTest(c *client.Client, ns string, podDescr *api.Pod, expectNumRe
 	By(fmt.Sprintf("Initial restart count of pod %s is %d", podDescr.Name, initialRestartCount))
 
 	// Wait for the restart state to be as desired.
-	deadline := time.Now().Add(2 * time.Minute)
+	deadline := time.Now().Add(timeout)
 	lastRestartCount := initialRestartCount
 	observedRestarts := 0
 	for start := time.Now(); time.Now().Before(deadline); time.Sleep(2 * time.Second) {
@@ -482,7 +486,7 @@ var _ = Describe("Pods", func() {
 					},
 				},
 			},
-		}, 1)
+		}, 1, defaultObservationTimeout)
 	})
 
 	It("should *not* be restarted with a docker exec \"cat /tmp/health\" liveness probe", func() {
@@ -508,7 +512,7 @@ var _ = Describe("Pods", func() {
 					},
 				},
 			},
-		}, 0)
+		}, 0, defaultObservationTimeout)
 	})
 
 	It("should be restarted with a /healthz http liveness probe", func() {
@@ -535,10 +539,10 @@ var _ = Describe("Pods", func() {
 					},
 				},
 			},
-		}, 1)
+		}, 1, defaultObservationTimeout)
 	})
 
-	PIt("should have monotonically increasing restart count", func() {
+	It("should have monotonically increasing restart count", func() {
 		runLivenessTest(framework.Client, framework.Namespace.Name, &api.Pod{
 			ObjectMeta: api.ObjectMeta{
 				Name:   "liveness-http",
@@ -562,7 +566,7 @@ var _ = Describe("Pods", func() {
 					},
 				},
 			},
-		}, 8)
+		}, 5, time.Minute*5)
 	})
 
 	It("should *not* be restarted with a /healthz http liveness probe", func() {
@@ -595,7 +599,7 @@ var _ = Describe("Pods", func() {
 					},
 				},
 			},
-		}, 0)
+		}, 0, defaultObservationTimeout)
 	})
 
 	// The following tests for remote command execution and port forwarding are