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Karmada (Kubernetes Armada) is a Kubernetes management system that enables cloud-native applications to run across multiple Kubernetes clusters and clouds with no changes to the underlying applications. By speaking Kubernetes-native APIs and providing advanced scheduling capabilities, Karmada truly enables multi-cloud Kubernetes environment. It aims to provide turnkey automation for multi-cluster application management in multi-cloud and hybrid cloud scenarios with key features such as centralized multi-cloud management, high availability, failure recovery, and traffic scheduling.

API2: "Federated Multi-Access Edge Cloud Platform" blueprint specific APIs 

// Cluster represents the desire state and status of a member cluster.
type Cluster struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`

// Spec represents the specification of the desired behavior of member cluster.
Spec ClusterSpec `json:"spec"`

// Status represents the status of member cluster.
// +optional
Status ClusterStatus `json:"status,omitempty"`
}

// ClusterSpec defines the desired state of a member cluster.
type ClusterSpec struct {
// SyncMode describes how a cluster sync resources from karmada control plane.
// +kubebuilder:validation:Enum=Push;Pull
// +required
SyncMode ClusterSyncMode `json:"syncMode"`

// The API endpoint of the member cluster. This can be a hostname,
// hostname:port, IP or IP:port.
// +optional
APIEndpoint string `json:"apiEndpoint,omitempty"`

// SecretRef represents the secret contains mandatory credentials to access the member cluster.
// The secret should hold credentials as follows:
// - secret.data.token
// - secret.data.caBundle
// +optional
SecretRef *LocalSecretReference `json:"secretRef,omitempty"`

// InsecureSkipTLSVerification indicates that the karmada control plane should not confirm the validity of the serving
// certificate of the cluster it is connecting to. This will make the HTTPS connection between the karmada control
// plane and the member cluster insecure.
// Defaults to false.
// +optional
InsecureSkipTLSVerification bool `json:"insecureSkipTLSVerification,omitempty"`

// ProxyURL is the proxy URL for the cluster.
// If not empty, the karmada control plane will use this proxy to talk to the cluster.
// More details please refer to: https://github.com/kubernetes/client-go/issues/351
// +optional
ProxyURL string `json:"proxyURL,omitempty"`

// Provider represents the cloud provider name of the member cluster.
// +optional
Provider string `json:"provider,omitempty"`

// Region represents the region of the member cluster locate in.
// +optional
Region string `json:"region,omitempty"`

// Zone represents the zone of the member cluster locate in.
// +optional
Zone string `json:"zone,omitempty"`

// Taints attached to the member cluster.
// Taints on the cluster have the "effect" on
// any resource that does not tolerate the Taint.
// +optional
Taints []corev1.Taint `json:"taints,omitempty"`
}

// ClusterStatus contains information about the current status of a
// cluster updated periodically by cluster controller.
type ClusterStatus struct {
// KubernetesVersion represents version of the member cluster.
// +optional
KubernetesVersion string `json:"kubernetesVersion,omitempty"`

// APIEnablements represents the list of APIs installed in the member cluster.
// +optional
APIEnablements []APIEnablement `json:"apiEnablements,omitempty"`

// Conditions is an array of current cluster conditions.
// +optional
Conditions []metav1.Condition `json:"conditions,omitempty"`

// NodeSummary represents the summary of nodes status in the member cluster.
// +optional
NodeSummary *NodeSummary `json:"nodeSummary,omitempty"`

// ResourceSummary represents the summary of resources in the member cluster.
// +optional
ResourceSummary *ResourceSummary `json:"resourceSummary,omitempty"`
}

// ResourceSummary represents the summary of resources in the member cluster.
type ResourceSummary struct {
// Allocatable represents the resources of a cluster that are available for scheduling.
// Total amount of allocatable resources on all nodes.
// +optional
Allocatable corev1.ResourceList `json:"allocatable,omitempty"`
// Allocating represents the resources of a cluster that are pending for scheduling.
// Total amount of required resources of all Pods that are waiting for scheduling.
// +optional
Allocating corev1.ResourceList `json:"allocating,omitempty"`
// Allocated represents the resources of a cluster that have been scheduled.
// Total amount of required resources of all Pods that have been scheduled to nodes.
// +optional
Allocated corev1.ResourceList `json:"allocated,omitempty"`
}

// ClusterList contains a list of member cluster
type ClusterList struct {
metav1.TypeMeta `json:",inline"`
metav1.ListMeta `json:"metadata,omitempty"`

// Items holds a list of Cluster.
Items []Cluster `json:"items"`
}

// PropagationPolicy represents the policy that propagates a group of resources to one or more clusters.
type PropagationPolicy struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`

// Spec represents the desired behavior of PropagationPolicy.
// +required
Spec PropagationSpec `json:"spec"`
}

// PropagationSpec represents the desired behavior of PropagationPolicy.
type PropagationSpec struct {
// ResourceSelectors used to select resources.
// +required
ResourceSelectors []ResourceSelector `json:"resourceSelectors"`

// Association tells if relevant resources should be selected automatically.
// e.g. a ConfigMap referred by a Deployment.
// default false.
// +optional
Association bool `json:"association,omitempty"`

// Placement represents the rule for select clusters to propagate resources.
// +optional
Placement Placement `json:"placement,omitempty"`

// DependentOverrides represents the list of overrides(OverridePolicy)
// which must present before the current PropagationPolicy takes effect.
//
// It used to explicitly specify overrides which current PropagationPolicy rely on.
// A typical scenario is the users create OverridePolicy(ies) and resources at the same time,
// they want to ensure the new-created policies would be adopted.
//
// Note: For the overrides, OverridePolicy(ies) in current namespace and ClusterOverridePolicy(ies),
// which not present in this list will still be applied if they matches the resources.
// +optional
DependentOverrides []string `json:"dependentOverrides,omitempty"`

// SchedulerName represents which scheduler to proceed the scheduling.
// If specified, the policy will be dispatched by specified scheduler.
// If not specified, the policy will be dispatched by default scheduler.
// +optional
SchedulerName string `json:"schedulerName,omitempty"`
}"Federated Multi-Access Edge Cloud Platform" blueprint specific APIs would be designed and built out as part of the future Akraino releases. Currently, the blueprint publishes APIs related to open source Karmada project only.