[nodeconfig] set log flush in kubeletconfig

this commit configures kubelet's logging flush frequency to 5 seconds
to ensure log entries are written to disk in near real-time, matching the
flush interval used for other Windows services (kube-proxy,
csi-proxy) that use kube-log-runner.

This provides consistent log behavior across all Windows node services
and ensures recent log entries are available for debugging without
excessive I/O overhead.

Author: jrvaldes

pkg/nodeconfig/nodeconfig.go

@@ -22,6 +22,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/kubernetes"
 	clientcmdv1 "k8s.io/client-go/tools/clientcmd/api/v1"
+	logsapi "k8s.io/component-base/logs/api/v1"
 	"k8s.io/kubectl/pkg/drain"
 	kubeletconfigv1 "k8s.io/kubelet/config/v1"
 	kubeletconfig "k8s.io/kubelet/config/v1beta1"
@@ -743,14 +744,20 @@ func generateKubeletConfiguration(clusterDNS string) kubeletconfig.KubeletConfig
 				Enabled: &falseBool,
 			},
 		},
-		ClusterDomain:          "cluster.local",
-		ClusterDNS:             []string{clusterDNS},
-		CgroupsPerQOS:          &falseBool,
-		RuntimeRequestTimeout:  meta.Duration{Duration: 10 * time.Minute},
-		MaxPods:                250,
-		KubeAPIQPS:             &kubeAPIQPS,
-		KubeAPIBurst:           100,
-		SerializeImagePulls:    &falseBool,
+		ClusterDomain:         "cluster.local",
+		ClusterDNS:            []string{clusterDNS},
+		CgroupsPerQOS:         &falseBool,
+		RuntimeRequestTimeout: meta.Duration{Duration: 10 * time.Minute},
+		MaxPods:               250,
+		KubeAPIQPS:            &kubeAPIQPS,
+		KubeAPIBurst:          100,
+		SerializeImagePulls:   &falseBool,
+		Logging: logsapi.LoggingConfiguration{
+			FlushFrequency: logsapi.TimeOrMetaDuration{
+				Duration:          meta.Duration{Duration: 5 * time.Second},
+				SerializeAsString: true,
+			},
+		},
 		EnableSystemLogHandler: &trueBool,
 		EnableSystemLogQuery:   &trueBool,
 		FeatureGates: map[string]bool{

pkg/nodeconfig/nodeconfig_test.go

@@ -84,7 +84,7 @@ func TestCreateKubeletConf(t *testing.T) {
 		{
 			name:         "valid cidr",
 			cidr:         "10.0.128.8/24",
-			expectedSpec: "{\"kind\":\"KubeletConfiguration\",\"apiVersion\":\"kubelet.config.k8s.io/v1beta1\",\"syncFrequency\":\"0s\",\"fileCheckFrequency\":\"0s\",\"httpCheckFrequency\":\"0s\",\"rotateCertificates\":true,\"serverTLSBootstrap\":true,\"authentication\":{\"x509\":{\"clientCAFile\":\"C:\\\\k\\\\kubelet-ca.crt\"},\"webhook\":{\"cacheTTL\":\"0s\"},\"anonymous\":{\"enabled\":false}},\"authorization\":{\"webhook\":{\"cacheAuthorizedTTL\":\"0s\",\"cacheUnauthorizedTTL\":\"0s\"}},\"clusterDomain\":\"cluster.local\",\"clusterDNS\":[\"10.0.128.10\"],\"streamingConnectionIdleTimeout\":\"0s\",\"nodeStatusUpdateFrequency\":\"0s\",\"nodeStatusReportFrequency\":\"0s\",\"imageMinimumGCAge\":\"0s\",\"imageMaximumGCAge\":\"0s\",\"volumeStatsAggPeriod\":\"0s\",\"cgroupsPerQOS\":false,\"cpuManagerReconcilePeriod\":\"0s\",\"runtimeRequestTimeout\":\"10m0s\",\"maxPods\":250,\"resolvConf\":\"\",\"kubeAPIQPS\":50,\"kubeAPIBurst\":100,\"serializeImagePulls\":false,\"evictionHard\":{\"imagefs.available\":\"15%\",\"nodefs.available\":\"10%\"},\"evictionPressureTransitionPeriod\":\"0s\",\"featureGates\":{\"NodeLogQuery\":true,\"RotateKubeletServerCertificate\":true},\"memorySwap\":{},\"containerLogMaxSize\":\"50Mi\",\"systemReserved\":{\"cpu\":\"500m\",\"ephemeral-storage\":\"1Gi\",\"memory\":\"2Gi\"},\"enforceNodeAllocatable\":[\"none\"],\"logging\":{\"flushFrequency\":0,\"verbosity\":0,\"options\":{\"text\":{\"infoBufferSize\":\"0\"},\"json\":{\"infoBufferSize\":\"0\"}}},\"enableSystemLogHandler\":true,\"enableSystemLogQuery\":true,\"shutdownGracePeriod\":\"0s\",\"shutdownGracePeriodCriticalPods\":\"0s\",\"crashLoopBackOff\":{},\"registerWithTaints\":[{\"key\":\"os\",\"value\":\"Windows\",\"effect\":\"NoSchedule\"}],\"registerNode\":true,\"containerRuntimeEndpoint\":\"npipe://./pipe/containerd-containerd\"}",
+			expectedSpec: "{\"kind\":\"KubeletConfiguration\",\"apiVersion\":\"kubelet.config.k8s.io/v1beta1\",\"syncFrequency\":\"0s\",\"fileCheckFrequency\":\"0s\",\"httpCheckFrequency\":\"0s\",\"rotateCertificates\":true,\"serverTLSBootstrap\":true,\"authentication\":{\"x509\":{\"clientCAFile\":\"C:\\\\k\\\\kubelet-ca.crt\"},\"webhook\":{\"cacheTTL\":\"0s\"},\"anonymous\":{\"enabled\":false}},\"authorization\":{\"webhook\":{\"cacheAuthorizedTTL\":\"0s\",\"cacheUnauthorizedTTL\":\"0s\"}},\"clusterDomain\":\"cluster.local\",\"clusterDNS\":[\"10.0.128.10\"],\"streamingConnectionIdleTimeout\":\"0s\",\"nodeStatusUpdateFrequency\":\"0s\",\"nodeStatusReportFrequency\":\"0s\",\"imageMinimumGCAge\":\"0s\",\"imageMaximumGCAge\":\"0s\",\"volumeStatsAggPeriod\":\"0s\",\"cgroupsPerQOS\":false,\"cpuManagerReconcilePeriod\":\"0s\",\"runtimeRequestTimeout\":\"10m0s\",\"maxPods\":250,\"resolvConf\":\"\",\"kubeAPIQPS\":50,\"kubeAPIBurst\":100,\"serializeImagePulls\":false,\"evictionHard\":{\"imagefs.available\":\"15%\",\"nodefs.available\":\"10%\"},\"evictionPressureTransitionPeriod\":\"0s\",\"featureGates\":{\"NodeLogQuery\":true,\"RotateKubeletServerCertificate\":true},\"memorySwap\":{},\"containerLogMaxSize\":\"50Mi\",\"systemReserved\":{\"cpu\":\"500m\",\"ephemeral-storage\":\"1Gi\",\"memory\":\"2Gi\"},\"enforceNodeAllocatable\":[\"none\"],\"logging\":{\"flushFrequency\":\"5s\",\"verbosity\":0,\"options\":{\"text\":{\"infoBufferSize\":\"0\"},\"json\":{\"infoBufferSize\":\"0\"}}},\"enableSystemLogHandler\":true,\"enableSystemLogQuery\":true,\"shutdownGracePeriod\":\"0s\",\"shutdownGracePeriodCriticalPods\":\"0s\",\"crashLoopBackOff\":{},\"registerWithTaints\":[{\"key\":\"os\",\"value\":\"Windows\",\"effect\":\"NoSchedule\"}],\"registerNode\":true,\"containerRuntimeEndpoint\":\"npipe://./pipe/containerd-containerd\"}",
 			expectedErr:  false,
 		},
 		{