add default for loggingconfiguration struct

pkg/kubelet/apis/config/fuzzer/fuzzer.go

@@ -100,6 +100,9 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
 			obj.ConfigMapAndSecretChangeDetectionStrategy = "Watch"
 			obj.AllowedUnsafeSysctls = []string{}
 			obj.VolumePluginDir = kubeletconfigv1beta1.DefaultVolumePluginDir
+			if obj.Logging.Format == "" {
+				obj.Logging.Format = "text"
+			}
 		},
 	}
 }

pkg/kubelet/apis/config/scheme/testdata/KubeletConfiguration/after/v1beta1.yaml

@@ -49,7 +49,8 @@ iptablesMasqueradeBit: 14
 kind: KubeletConfiguration
 kubeAPIBurst: 10
 kubeAPIQPS: 5
-logging: {}
+logging:
+  format: text
 makeIPTablesUtilChains: true
 maxOpenFiles: 1000000
 maxPods: 110

pkg/kubelet/apis/config/scheme/testdata/KubeletConfiguration/roundtrip/default/v1beta1.yaml

@@ -49,7 +49,8 @@ iptablesMasqueradeBit: 14
 kind: KubeletConfiguration
 kubeAPIBurst: 10
 kubeAPIQPS: 5
-logging: {}
+logging:
+  format: text
 makeIPTablesUtilChains: true
 maxOpenFiles: 1000000
 maxPods: 110

pkg/kubelet/apis/config/v1beta1/defaults.go

@@ -21,6 +21,7 @@ import (
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	kruntime "k8s.io/apimachinery/pkg/runtime"
+	componentbaseconfigv1alpha1 "k8s.io/component-base/config/v1alpha1"
 	kubeletconfigv1beta1 "k8s.io/kubelet/config/v1beta1"
 	// TODO: Cut references to k8s.io/kubernetes, eventually there should be none from this package
 	"k8s.io/kubernetes/pkg/kubelet/qos"
@@ -233,4 +234,6 @@ func SetDefaults_KubeletConfiguration(obj *kubeletconfigv1beta1.KubeletConfigura
 	if obj.VolumePluginDir == "" {
 		obj.VolumePluginDir = DefaultVolumePluginDir
 	}
+	// Use the Default LoggingConfiguration option
+	componentbaseconfigv1alpha1.RecommendedLoggingConfiguration(&obj.Logging)
 }