diff --git a/internal/cnpgi/metadata/constants.go b/internal/cnpgi/metadata/constants.go
index 83ff086..fb45da6 100644
--- a/internal/cnpgi/metadata/constants.go
+++ b/internal/cnpgi/metadata/constants.go
@@ -28,8 +28,24 @@ const PluginName = "barman-cloud.cloudnative-pg.io"
 const (
 	// ClusterLabelName is the label applied to RBAC resources created
 	// by this plugin. Its value is the name of the owning Cluster.
+	//
+	// Discovery contract: internal/controller/objectstore_controller.go
+	// selects Roles by this key when an ObjectStore is reconciled.
+	// Renaming or removing the label would break that controller; new
+	// recommended-label keys are added alongside it, never in place
+	// of it.
 	ClusterLabelName = "barmancloud.cnpg.io/cluster"
 
+	// AppLabelValue is the value applied to app.kubernetes.io/name on
+	// every plugin-managed object. It identifies the application as
+	// the Barman Cloud plugin (see issue #545).
+	AppLabelValue = "barman-cloud-plugin"
+
+	// ManagedByLabelValue is the value applied to app.kubernetes.io/managed-by
+	// on every plugin-managed object. It identifies this plugin as
+	// the controller responsible for the object.
+	ManagedByLabelValue = "plugin-barman-cloud"
+
 	// CheckEmptyWalArchiveFile is the name of the file in the PGDATA that,
 	// if present, requires the WAL archiver to check that the backup object
 	// store is empty.
diff --git a/internal/cnpgi/operator/rbac/ensure_test.go b/internal/cnpgi/operator/rbac/ensure_test.go
index 6214b63..e3d7885 100644
--- a/internal/cnpgi/operator/rbac/ensure_test.go
+++ b/internal/cnpgi/operator/rbac/ensure_test.go
@@ -45,11 +45,11 @@ import (
 
 func expectRequiredLabels(labels map[string]string, clusterName string) {
 	ExpectWithOffset(1, labels).To(HaveKeyWithValue(metadata.ClusterLabelName, clusterName))
-	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppLabelName, utils.AppName))
+	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppLabelName, metadata.AppLabelValue))
 	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppInstanceLabelName, clusterName))
-	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppManagedByLabelName, "plugin-barman-cloud"))
+	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppManagedByLabelName, metadata.ManagedByLabelValue))
 	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppComponentLabelName, utils.DatabaseComponentName))
-	ExpectWithOffset(1, labels).To(HaveKey(utils.KubernetesAppVersionLabelName))
+	ExpectWithOffset(1, labels).To(HaveKeyWithValue(utils.KubernetesAppVersionLabelName, metadata.Data.Version))
 }
 
 func newScheme() *runtime.Scheme {
diff --git a/internal/cnpgi/operator/specs/labels.go b/internal/cnpgi/operator/specs/labels.go
index cdb1b9f..3d9042b 100644
--- a/internal/cnpgi/operator/specs/labels.go
+++ b/internal/cnpgi/operator/specs/labels.go
@@ -20,28 +20,22 @@ SPDX-License-Identifier: Apache-2.0
 package specs
 
 import (
-	"fmt"
-
 	cnpgv1 "github.com/cloudnative-pg/cloudnative-pg/api/v1"
 	"github.com/cloudnative-pg/cloudnative-pg/pkg/utils"
 
 	"github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/metadata"
 )
 
-// BuildLabels returns the labels that must be present on all plugin-managed objects for a given Cluster.
+// BuildLabels returns the Kubernetes recommended labels applied to
+// every object managed by this plugin for the given Cluster. See
+// https://github.com/cloudnative-pg/plugin-barman-cloud/issues/545.
 func BuildLabels(cluster *cnpgv1.Cluster) map[string]string {
-	requiredLabels := map[string]string{
-		metadata.ClusterLabelName: cluster.Name,
-		// Kubernetes recommended labels
-		utils.KubernetesAppLabelName:          utils.AppName,
+	return map[string]string{
+		metadata.ClusterLabelName:             cluster.Name,
+		utils.KubernetesAppLabelName:          metadata.AppLabelValue,
 		utils.KubernetesAppInstanceLabelName:  cluster.Name,
-		utils.KubernetesAppManagedByLabelName: "plugin-barman-cloud",
+		utils.KubernetesAppVersionLabelName:   metadata.Data.Version,
 		utils.KubernetesAppComponentLabelName: utils.DatabaseComponentName,
+		utils.KubernetesAppManagedByLabelName: metadata.ManagedByLabelValue,
 	}
-
-	if version, err := cluster.GetPostgresqlMajorVersion(); err == nil && version != 0 {
-		requiredLabels[utils.KubernetesAppVersionLabelName] = fmt.Sprint(version)
-	}
-
-	return requiredLabels
 }
diff --git a/internal/cnpgi/operator/specs/labels_test.go b/internal/cnpgi/operator/specs/labels_test.go
index a0cca62..82fe8ae 100644
--- a/internal/cnpgi/operator/specs/labels_test.go
+++ b/internal/cnpgi/operator/specs/labels_test.go
@@ -30,7 +30,7 @@ import (
 )
 
 var _ = Describe("BuildLabels", func() {
-	It("should return all expected labels for a cluster without an image", func() {
+	It("should return the recommended labels with plugin identity", func() {
 		cluster := &cnpgv1.Cluster{
 			ObjectMeta: metav1.ObjectMeta{
 				Name:      "my-cluster",
@@ -40,14 +40,15 @@ var _ = Describe("BuildLabels", func() {
 		labels := BuildLabels(cluster)
 
 		Expect(labels).To(HaveKeyWithValue(metadata.ClusterLabelName, "my-cluster"))
-		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppLabelName, utils.AppName))
+		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppLabelName, metadata.AppLabelValue))
 		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppInstanceLabelName, "my-cluster"))
-		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppManagedByLabelName, "plugin-barman-cloud"))
+		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppVersionLabelName, metadata.Data.Version))
 		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppComponentLabelName, utils.DatabaseComponentName))
+		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppManagedByLabelName, metadata.ManagedByLabelValue))
 		Expect(labels).To(HaveLen(6))
 	})
 
-	It("should use the major version from the image catalog ref", func() {
+	It("should report the plugin version regardless of the cluster's Postgres image", func() {
 		cluster := &cnpgv1.Cluster{
 			ObjectMeta: metav1.ObjectMeta{
 				Name:      "pg16-cluster",
@@ -61,7 +62,7 @@ var _ = Describe("BuildLabels", func() {
 		}
 		labels := BuildLabels(cluster)
 
-		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppVersionLabelName, "16"))
+		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppVersionLabelName, metadata.Data.Version))
 		Expect(labels).To(HaveKeyWithValue(utils.KubernetesAppInstanceLabelName, "pg16-cluster"))
 	})
 })