fix(pending-actions): correctly detect unreachable/down cluster [EE-7049] (#11809)

api/kubernetes/cli/server_version.go

@@ -0,0 +1,7 @@
+package cli
+
+import "k8s.io/apimachinery/pkg/version"
+
+func (kcl *KubeClient) ServerVersion() (*version.Info, error) {
+	return kcl.cli.Discovery().ServerVersion()
+}

api/pendingactions/pendingactions.go

@@ -73,8 +73,16 @@ func (service *PendingActionsService) Execute(id portainer.EndpointID) {
 			return
 		}
 	} else {
-		// For Kubernetes endpoints, we need to check if the client can be created
+		// For Kubernetes endpoints, we need to check if the endpoint is up by
-		if _, err := service.kubeFactory.GetKubeClient(endpoint); err != nil {
+		// creating a kube client and performing a simple operation
+		client, err := service.kubeFactory.GetKubeClient(endpoint)
+		if err != nil {
+			log.Debug().Msgf("failed to create Kubernetes client for environment %d: %v", id, err)
+			return
+		}
+
+		if _, err = client.ServerVersion(); err != nil {
+			log.Debug().Err(err).Msgf("Environment %q (id: %d) is not up", endpoint.Name, id)
 			return
 		}
 	}

api/portainer.go

@@ -14,6 +14,7 @@ import (
 	"github.com/portainer/portainer/pkg/featureflags"
 	"golang.org/x/oauth2"
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/version"
 )
 
 type (
@@ -1487,6 +1488,8 @@ type (
 
 	// KubeClient represents a service used to query a Kubernetes environment(endpoint)
 	KubeClient interface {
+		ServerVersion() (*version.Info, error)
+
 		SetupUserServiceAccount(userID int, teamIDs []int, restrictDefaultNamespace bool) error
 		IsRBACEnabled() (bool, error)
 		GetServiceAccount(tokendata *TokenData) (*v1.ServiceAccount, error)