implementation of the DelayActivation strategy for Policy

Signed-off-by: chaosi-zju <chaosi@zju.edu.cn>

api/openapi-spec/swagger.json

@@ -17148,6 +17148,10 @@
         "resourceSelectors"
       ],
       "properties": {
+        "activationStrategy": {
+          "description": "ActivationStrategy declares how creation/modification/deletion to the Policy affect the resources it matches.\n\nThe value \"Immediate\" means the matched resource will respond to the creation/modification/deletion immediately.\n\nThe value \"Delay\" means the matched resource will delay to respond to the creation/modification/deletion until the resource itself is modified (In 1:N scenario where one Policy manages many resource templates, changes to a Policy typically affect numerous applications simultaneously. If there are errors in the Policy configuration, it could lead to widespread failures. By using this setting to delay the implementation of changes, the changed Policy can be gradually rolled out through iterative modifications to application configurations).\n\nIf the field is unset, the default strategy is \"Immediate\".",
+          "type": "string"
+        },
         "association": {
           "description": "Association tells if relevant resources should be selected automatically. e.g. a ConfigMap referred by a Deployment. default false. Deprecated: in favor of PropagateDeps.",
           "type": "boolean"

charts/karmada/_crds/bases/policy/policy.karmada.io_clusterpropagationpolicies.yaml

@@ -44,6 +44,20 @@ spec:
           spec:
             description: Spec represents the desired behavior of ClusterPropagationPolicy.
             properties:
+              activationStrategy:
+                description: "ActivationStrategy declares how creation/modification/deletion
+                  to the Policy affect the resources it matches. \n The value \"Immediate\"
+                  means the matched resource will respond to the creation/modification/deletion
+                  immediately. \n The value \"Delay\" means the matched resource will
+                  delay to respond to the creation/modification/deletion until the
+                  resource itself is modified (In 1:N scenario where one Policy manages
+                  many resource templates, changes to a Policy typically affect numerous
+                  applications simultaneously. If there are errors in the Policy configuration,
+                  it could lead to widespread failures. By using this setting to delay
+                  the implementation of changes, the changed Policy can be gradually
+                  rolled out through iterative modifications to application configurations).
+                  \n If the field is unset, the default strategy is \"Immediate\"."
+                type: string
               association:
                 description: 'Association tells if relevant resources should be selected
                   automatically. e.g. a ConfigMap referred by a Deployment. default

charts/karmada/_crds/bases/policy/policy.karmada.io_propagationpolicies.yaml

@@ -40,6 +40,20 @@ spec:
           spec:
             description: Spec represents the desired behavior of PropagationPolicy.
             properties:
+              activationStrategy:
+                description: "ActivationStrategy declares how creation/modification/deletion
+                  to the Policy affect the resources it matches. \n The value \"Immediate\"
+                  means the matched resource will respond to the creation/modification/deletion
+                  immediately. \n The value \"Delay\" means the matched resource will
+                  delay to respond to the creation/modification/deletion until the
+                  resource itself is modified (In 1:N scenario where one Policy manages
+                  many resource templates, changes to a Policy typically affect numerous
+                  applications simultaneously. If there are errors in the Policy configuration,
+                  it could lead to widespread failures. By using this setting to delay
+                  the implementation of changes, the changed Policy can be gradually
+                  rolled out through iterative modifications to application configurations).
+                  \n If the field is unset, the default strategy is \"Immediate\"."
+                type: string
               association:
                 description: 'Association tells if relevant resources should be selected
                   automatically. e.g. a ConfigMap referred by a Deployment. default

pkg/apis/policy/v1alpha1/propagation_types.go

@@ -152,6 +152,21 @@ type PropagationSpec struct {
 	// +kubebuilder:validation:Enum=Abort;Overwrite
 	// +optional
 	ConflictResolution ConflictResolution `json:"conflictResolution,omitempty"`
+
+	// ActivationStrategy declares how creation/modification/deletion to the Policy affect the resources it matches.
+	//
+	// The value "Immediate" means the matched resource will respond to the creation/modification/deletion immediately.
+	//
+	// The value "Delay" means the matched resource will delay to respond to the creation/modification/deletion until
+	// the resource itself is modified (In 1:N scenario where one Policy manages many resource templates,
+	// changes to a Policy typically affect numerous applications simultaneously. If there are errors in the Policy
+	// configuration, it could lead to widespread failures. By using this setting to delay the implementation of changes,
+	// the changed Policy can be gradually rolled out through iterative modifications to application configurations).
+	//
+	// If the field is unset, the default strategy is "Immediate".
+	//
+	// +optional
+	ActivationStrategy ActivationStrategy `json:"activationStrategy,omitempty"`
 }
 
 // ResourceSelector the resources will be selected.
@@ -518,6 +533,15 @@ const (
 	ConflictAbort ConflictResolution = "Abort"
 )
 
+// ActivationStrategy declares how creation/modification/deletion to the Policy affect the resources it matches.
+type ActivationStrategy string
+
+const (
+	// LazyActivation means the matched resource will delay to respond to the creation/modification/deletion until
+	// the resource itself is modified
+	LazyActivation ActivationStrategy = "Lazy"
+)
+
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
 // PropagationPolicyList contains a list of PropagationPolicy.