That could be an option for those who want to maintain NamespacedCloudProfiles on their own, but some users do not want to carry this burden. Without getting into much details, users can optionally specify osVersionUpdateStrategy in

gardener/pkg/apis/core/v1beta1/types_shoot.go

Lines 1494 to 1501 in 3ff3632

    
           // MaintenanceAutoUpdate contains information about which constraints should be automatically updated. 
        
           type MaintenanceAutoUpdate struct { 
        
           	// KubernetesVersion indicates whether the patch Kubernetes version may be automatically updated (default: true). 
        
           	KubernetesVersion bool `json:"kubernetesVersion" protobuf:"varint,1,opt,name=kubernetesVersion"` 
        
           	// MachineImageVersion indicates whether the machine image version may be automatically updated (default: true). 
        
           	// +optional 
        
           	MachineImageVersion *bool `json:"machineImageVersion,omitempty" protobuf:"varint,2,opt,name=machineImageVersion"` 
        
           }

which will override the one from the CloudProfile. It may be even better this behavior to be controlled per worker pool because each worker pool may use different OS/version or serve different purposes that may or may not allow respective version auto update.

	// MaintenanceAutoUpdate contains information about which constraints should be automatically updated.
	type MaintenanceAutoUpdate struct {
	// KubernetesVersion indicates whether the patch Kubernetes version may be automatically updated (default: true).
	KubernetesVersion bool `json:"kubernetesVersion" protobuf:"varint,1,opt,name=kubernetesVersion"`
	// MachineImageVersion indicates whether the machine image version may be automatically updated (default: true).
	// +optional
	MachineImageVersion *bool `json:"machineImageVersion,omitempty" protobuf:"varint,2,opt,name=machineImageVersion"`
	}

Override OS updateStrategy per shoot resource #11520

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