optimize: add probe for cluster status

cmd/controller-manager/app/options/options.go

@@ -55,6 +55,7 @@ type Options struct {
 
 	NSAutoPropExcludeRegexp  string
 	ClusterJoinTimeout       time.Duration
+	ClusterStatusThreshold   time.Duration
 	MemberObjectEnqueueDelay time.Duration
 
 	MaxPodListers    int64
@@ -174,6 +175,13 @@ func (o *Options) AddFlags(flags *pflag.FlagSet, allControllers []string, disabl
 		time.Second*30,
 		"The period of health check for member clusters. The minimum value is "+MinClusterHealthCheckPeriod.String()+".",
 	)
+
+	flags.DurationVar(
+		&o.ClusterStatusThreshold,
+		"cluster-status-threshold",
+		time.Second*100,
+		"The threshold of member clusters status change.",
+	)
 }
 
 func (o *Options) addKlogFlags(flags *pflag.FlagSet) {

cmd/controller-manager/app/util.go

@@ -185,6 +185,7 @@ func getComponentConfig(opts *options.Options) (*controllercontext.ComponentConf
 		MemberObjectEnqueueDelay: opts.MemberObjectEnqueueDelay,
 		EnableKatalystSupport:    opts.EnableKatalystSupport,
 		ClusterHealthCheckPeriod: opts.ClusterHealthCheckPeriod,
+		ClusterStatusThreshold:   opts.ClusterStatusThreshold,
 	}
 
 	if opts.ClusterHealthCheckPeriod < options.MinClusterHealthCheckPeriod {

pkg/controllers/context/context.go

@@ -85,4 +85,5 @@ type ComponentConfig struct {
 	ResourceAggregationNodeFilter []labels.Selector
 	EnableKatalystSupport         bool
 	ClusterHealthCheckPeriod      time.Duration
+	ClusterStatusThreshold        time.Duration
 }

pkg/controllers/federatedcluster/cluster_status_cache.go

@@ -0,0 +1,103 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+This file may have been modified by The KubeAdmiral Authors
+("KubeAdmiral Modifications"). All KubeAdmiral Modifications
+are Copyright 2023 The KubeAdmiral Authors.
+*/
+
+package federatedcluster
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"k8s.io/klog/v2"
+
+	fedcorev1a1 "github.com/kubewharf/kubeadmiral/pkg/apis/core/v1alpha1"
+)
+
+type clusterStatusStore struct {
+	clusterStatusData      sync.Map
+	clusterStatusThreshold time.Duration
+}
+
+type clusterStatusConditionData struct {
+	offlineCondition fedcorev1a1.ClusterCondition
+	readyCondition   fedcorev1a1.ClusterCondition
+	probeTimestamp   time.Time
+}
+
+func (c *clusterStatusStore) thresholdAdjustedStatusCondition(
+	ctx context.Context,
+	cluster *fedcorev1a1.FederatedCluster,
+	observedOfflineCondition fedcorev1a1.ClusterCondition,
+	observedReadyCondition fedcorev1a1.ClusterCondition,
+) (fedcorev1a1.ClusterCondition, fedcorev1a1.ClusterCondition) {
+	logger := klog.FromContext(ctx)
+
+	saved := c.get(cluster.Name)
+	if saved == nil {
+		// the cluster is just joined
+		c.update(cluster.Name, &clusterStatusConditionData{
+			offlineCondition: observedOfflineCondition,
+			readyCondition:   observedReadyCondition,
+		})
+		return observedOfflineCondition, observedReadyCondition
+	}
+	curOfflineCondition := getClusterCondition(&cluster.Status, fedcorev1a1.ClusterOffline)
+	curReadyCondition := getClusterCondition(&cluster.Status, fedcorev1a1.ClusterReady)
+	if curOfflineCondition == nil || curReadyCondition == nil {
+		return observedOfflineCondition, observedReadyCondition
+	}
+
+	now := time.Now()
+	if saved.offlineCondition.Status != observedOfflineCondition.Status || saved.readyCondition.Status != observedReadyCondition.Status {
+		// condition status changed, record the probe timestamp
+		saved = &clusterStatusConditionData{
+			offlineCondition: observedOfflineCondition,
+			readyCondition:   observedReadyCondition,
+			probeTimestamp:   now,
+		}
+	}
+	c.update(cluster.Name, saved)
+
+	if curOfflineCondition.Status != observedOfflineCondition.Status || curReadyCondition.Status != observedReadyCondition.Status {
+		// threshold not exceeded, return the old status condition
+		if now.Before(saved.probeTimestamp.Add(c.clusterStatusThreshold)) {
+			logger.V(3).WithValues("offline", curOfflineCondition.Status, "ready", curReadyCondition.Status).
+				Info("Threshold not exceeded, return the old status condition")
+			return *curOfflineCondition, *curReadyCondition
+		}
+
+		logger.V(3).WithValues("offline", observedOfflineCondition.Status, "ready", observedReadyCondition.Status).
+			Info("Cluster status condition changed")
+	}
+
+	return observedOfflineCondition, observedReadyCondition
+}
+
+func (c *clusterStatusStore) get(cluster string) *clusterStatusConditionData {
+	condition, ok := c.clusterStatusData.Load(cluster)
+	if !ok {
+		return nil
+	}
+	return condition.(*clusterStatusConditionData)
+}
+
+func (c *clusterStatusStore) update(cluster string, data *clusterStatusConditionData) {
+	c.clusterStatusData.Store(cluster, data)
+}

pkg/controllers/federatedcluster/clusterstatus.go

@@ -298,8 +298,11 @@ func (c *FederatedClusterController) collectIndividualClusterStatus(
 	}
 
 	offlineCondition := getNewClusterOfflineCondition(offlineStatus, conditionTime)
-	setClusterCondition(&cluster.Status, &offlineCondition)
 	readyCondition := getNewClusterReadyCondition(readyStatus, readyReason, readyMessage, conditionTime)
+
+	offlineCondition, readyCondition = c.clusterStatusCache.thresholdAdjustedStatusCondition(ctx, cluster, offlineCondition, readyCondition)
+
+	setClusterCondition(&cluster.Status, &offlineCondition)
 	setClusterCondition(&cluster.Status, &readyCondition)
 
 	if err := retry.RetryOnConflict(retry.DefaultBackoff, func() error {

pkg/controllers/federatedcluster/controller.go

@@ -85,6 +85,7 @@ type FederatedClusterController struct {
 	clusterHealthCheckConfig      *ClusterHealthCheckConfig
 	clusterJoinTimeout            time.Duration
 	resourceAggregationNodeFilter []labels.Selector
+	clusterStatusCache            clusterStatusStore
 
 	lock                                       sync.Mutex
 	clusterConnectionHashes                    map[string]string
@@ -120,6 +121,10 @@ func NewFederatedClusterController(
 		clusterHealthCheckConfig: &ClusterHealthCheckConfig{
 			Period: componentConfig.ClusterHealthCheckPeriod,
 		},
+		clusterStatusCache: clusterStatusStore{
+			clusterStatusData:      sync.Map{},
+			clusterStatusThreshold: componentConfig.ClusterStatusThreshold,
+		},
 
 		lock:                                       sync.Mutex{},
 		clusterConnectionHashes:                    map[string]string{},