e2e/network: stream pod logs for debugging

Intermittent logging to understand root cause of
https://github.com/kubernetes/kubernetes/issues/123760

Signed-off-by: Daman Arora <aroradaman@gmail.com>

test/e2e/network/networking.go

@@ -17,6 +17,7 @@ limitations under the License.
 package network
 
 import (
+	"bufio"
 	"context"
 	"fmt"
 	"strconv"
@@ -327,6 +328,37 @@ var _ = common.SIGDescribe("Networking", func() {
 
 		ginkgo.It("should update endpoints: http", func(ctx context.Context) {
 			config := e2enetwork.NewNetworkingTestConfig(ctx, f)
+
+			// start of intermittent code snippet to understand the reason for flaky behaviour
+			// TODO @aroradaman @aojea remove this once issue #123760 is resolved
+			// streaming logs for netserver-0 which will be deleted during the test
+			// (ref: https://github.com/kubernetes/kubernetes/issues/123760)
+			pod0name := config.EndpointPods[0].Name
+			go func() {
+				defer ginkgo.GinkgoRecover()
+				readCloser, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).GetLogs(pod0name, &v1.PodLogOptions{
+					Follow: true,
+				}).Stream(ctx)
+
+				// silently ignoring error, we don't want to disturb the original test
+				if err != nil {
+					return
+				}
+				defer func() {
+					_ = readCloser.Close()
+				}()
+
+				scanner := bufio.NewScanner(readCloser)
+				var lines []string
+				for scanner.Scan() {
+					lines = append(lines, "\t\t"+scanner.Text())
+				}
+				framework.Logf("================ start of pod log for %s ================", pod0name)
+				framework.Logf("\n%s", strings.Join(lines, "\n"))
+				framework.Logf("================ end of pod log for %s ================", pod0name)
+			}()
+			// end of intermittent code snippet
+
 			ginkgo.By(fmt.Sprintf("dialing(http) %v --> %v:%v (config.clusterIP)", config.TestContainerPod.Name, config.ClusterIP, e2enetwork.ClusterHTTPPort))
 			err := config.DialFromTestContainer(ctx, "http", config.ClusterIP, e2enetwork.ClusterHTTPPort, config.MaxTries, 0, config.EndpointHostnames())
 			if err != nil {