✨ feat: Implement autoscaling from zero by auto-populating AWSMachineTemplate capacity

api/v1beta1/awsmachine_conversion.go

@@ -136,6 +136,10 @@ func (r *AWSMachineTemplate) ConvertTo(dstRaw conversion.Hub) error {
 		}
 	}
 
+	// Restore Status fields that don't exist in v1beta1.
+	dst.Status.NodeInfo = restored.Status.NodeInfo
+	dst.Status.Conditions = restored.Status.Conditions
+
 	return nil
 }
 

api/v1beta1/conversion.go

@@ -108,3 +108,8 @@ func Convert_v1beta2_AWSMachineStatus_To_v1beta1_AWSMachineStatus(in *v1beta2.AW
 	// Note: DedicatedHostID is not present in v1beta1, so it will be dropped during conversion
 	return autoConvert_v1beta2_AWSMachineStatus_To_v1beta1_AWSMachineStatus(in, out, s)
 }
+
+func Convert_v1beta2_AWSMachineTemplateStatus_To_v1beta1_AWSMachineTemplateStatus(in *v1beta2.AWSMachineTemplateStatus, out *AWSMachineTemplateStatus, s conversion.Scope) error {
+	// NodeInfo and Conditions fields are ignored (dropped) as they don't exist in v1beta1
+	return autoConvert_v1beta2_AWSMachineTemplateStatus_To_v1beta1_AWSMachineTemplateStatus(in, out, s)
+}

api/v1beta2/awsmachinetemplate_types.go

@@ -23,13 +23,59 @@ import (
 	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
 )
 
+// Architecture represents the CPU architecture of the node.
+// Its underlying type is a string and its value can be any of amd64, arm64.
+type Architecture string
+
+// Architecture constants.
+const (
+	ArchitectureAmd64 Architecture = "amd64"
+	ArchitectureArm64 Architecture = "arm64"
+)
+
+// OperatingSystem represents the operating system of the node.
+// Its underlying type is a string and its value can be any of linux, windows.
+type OperatingSystem string
+
+// Operating system constants.
+const (
+	// OperatingSystemLinux represents the Linux operating system.
+	OperatingSystemLinux OperatingSystem = "linux"
+	// OperatingSystemWindows represents the Windows operating system.
+	OperatingSystemWindows OperatingSystem = "windows"
+)
+
+// NodeInfo contains information about the node's architecture and operating system.
+type NodeInfo struct {
+	// Architecture is the CPU architecture of the node.
+	// Its underlying type is a string and its value can be any of amd64, arm64.
+	// +kubebuilder:validation:Enum=amd64;arm64
+	// +optional
+	Architecture Architecture `json:"architecture,omitempty"`
+	// OperatingSystem is the operating system of the node.
+	// Its underlying type is a string and its value can be any of linux, windows.
+	// +kubebuilder:validation:Enum=linux;windows
+	// +optional
+	OperatingSystem OperatingSystem `json:"operatingSystem,omitempty"`
+}
+
 // AWSMachineTemplateStatus defines a status for an AWSMachineTemplate.
 type AWSMachineTemplateStatus struct {
 	// Capacity defines the resource capacity for this machine.
 	// This value is used for autoscaling from zero operations as defined in:
 	// https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md
 	// +optional
 	Capacity corev1.ResourceList `json:"capacity,omitempty"`
+
+	// NodeInfo contains information about the node's architecture and operating system.
+	// This value is used for autoscaling from zero operations as defined in:
+	// https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md
+	// +optional
+	NodeInfo *NodeInfo `json:"nodeInfo,omitempty"`
+
+	// Conditions defines current service state of the AWSMachineTemplate.
+	// +optional
+	Conditions clusterv1.Conditions `json:"conditions,omitempty"`
 }
 
 // AWSMachineTemplateSpec defines the desired state of AWSMachineTemplate.
@@ -40,6 +86,7 @@ type AWSMachineTemplateSpec struct {
 // +kubebuilder:object:root=true
 // +kubebuilder:resource:path=awsmachinetemplates,scope=Namespaced,categories=cluster-api,shortName=awsmt
 // +kubebuilder:storageversion
+// +kubebuilder:subresource:status
 // +k8s:defaulter-gen=true
 
 // AWSMachineTemplate is the schema for the Amazon EC2 Machine Templates API.
@@ -71,6 +118,16 @@ type AWSMachineTemplateResource struct {
 	Spec AWSMachineSpec `json:"spec"`
 }
 
+// GetConditions returns the observations of the operational state of the AWSMachineTemplate resource.
+func (r *AWSMachineTemplate) GetConditions() clusterv1.Conditions {
+	return r.Status.Conditions
+}
+
+// SetConditions sets the underlying service state of the AWSMachineTemplate to the predescribed clusterv1.Conditions.
+func (r *AWSMachineTemplate) SetConditions(conditions clusterv1.Conditions) {
+	r.Status.Conditions = conditions
+}
+
 func init() {
 	SchemeBuilder.Register(&AWSMachineTemplate{}, &AWSMachineTemplateList{})
 }

config/crd/bases/infrastructure.cluster.x-k8s.io_awsmachinetemplates.yaml

@@ -1156,7 +1156,84 @@ spec:
                   This value is used for autoscaling from zero operations as defined in:
                   https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md
                 type: object
+              conditions:
+                description: Conditions defines current service state of the AWSMachineTemplate.
+                items:
+                  description: Condition defines an observation of a Cluster API resource
+                    operational state.
+                  properties:
+                    lastTransitionTime:
+                      description: |-
+                        lastTransitionTime is the last time the condition transitioned from one status to another.
+                        This should be when the underlying condition changed. If that is not known, then using the time when
+                        the API field changed is acceptable.
+                      format: date-time
+                      type: string
+                    message:
+                      description: |-
+                        message is a human readable message indicating details about the transition.
+                        This field may be empty.
+                      maxLength: 10240
+                      minLength: 1
+                      type: string
+                    reason:
+                      description: |-
+                        reason is the reason for the condition's last transition in CamelCase.
+                        The specific API may choose whether or not this field is considered a guaranteed API.
+                        This field may be empty.
+                      maxLength: 256
+                      minLength: 1
+                      type: string
+                    severity:
+                      description: |-
+                        severity provides an explicit classification of Reason code, so the users or machines can immediately
+                        understand the current situation and act accordingly.
+                        The Severity field MUST be set only when Status=False.
+                      maxLength: 32
+                      type: string
+                    status:
+                      description: status of the condition, one of True, False, Unknown.
+                      type: string
+                    type:
+                      description: |-
+                        type of condition in CamelCase or in foo.example.com/CamelCase.
+                        Many .condition.type values are consistent across resources like Available, but because arbitrary conditions
+                        can be useful (see .node.status.conditions), the ability to deconflict is important.
+                      maxLength: 256
+                      minLength: 1
+                      type: string
+                  required:
+                  - lastTransitionTime
+                  - status
+                  - type
+                  type: object
+                type: array
+              nodeInfo:
+                description: |-
+                  NodeInfo contains information about the node's architecture and operating system.
+                  This value is used for autoscaling from zero operations as defined in:
+                  https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md
+                properties:
+                  architecture:
+                    description: |-
+                      Architecture is the CPU architecture of the node.
+                      Its underlying type is a string and its value can be any of amd64, arm64.
+                    enum:
+                    - amd64
+                    - arm64
+                    type: string
+                  operatingSystem:
+                    description: |-
+                      OperatingSystem is the operating system of the node.
+                      Its underlying type is a string and its value can be any of linux, windows.
+                    enum:
+                    - linux
+                    - windows
+                    type: string
+                type: object
             type: object
         type: object
     served: true
     storage: true
+    subresources:
+      status: {}

config/rbac/role.yaml

@@ -175,6 +175,7 @@ rules:
   resources:
   - awsclusters/status
   - awsfargateprofiles/status
+  - awsmachinetemplates/status
   - rosaclusters/status
   - rosanetworks/status
   - rosaroleconfigs/status