Set recommended kubernetes labels on services and workflows

Motivation:
There's a need to select efficiently workflows and their respective
services. Having the common kubernetes labels allow a single selector:

   podSelector:
     matchExpressions:
       - { key: app.kubernetes.io/component, operator: In, values:
         ["data-index-service", "jobs-service", "serverless-workflow"] }

Modification:
Make the v1.Deployment for services and the deployment or knative
services to contain at common labels

Result:
A workflow deployment or knative serving labels:
    app.kubernetes.io/name: ${workflow name}
    app.kubernetes.io/component: serverless-workflow
    app.kubernetes.io/part-of: ${platform url set by status}
    app.kubernetes.io/managed-by: sonataflow-operator

Data index or Jobs services Deployment.v1 labels:

    app.kubernetes.io/name: ${service name}
    app.kubernetes.io/component: data-index-service|jobs-service
    app.kubernetes.io/part-of: ${platform name}
    app.kubernetes.io/managed-by: sonataflow-operator

Reference: https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/#labels

Signed-off-by: Roy Golan <[email protected]>

controllers/platform/k8s.go

@@ -233,8 +233,12 @@ func createOrUpdateService(ctx context.Context, client client.Client, platform *
 
 func getLabels(platform *operatorapi.SonataFlowPlatform, psh services.PlatformServiceHandler) (map[string]string, map[string]string) {
 	lbl := map[string]string{
-		workflowproj.LabelApp:     platform.Name,
-		workflowproj.LabelService: psh.GetServiceName(),
+		workflowproj.LabelApp:          platform.Name,
+		workflowproj.LabelService:      psh.GetServiceName(),
+		workflowproj.LabelK8SName:      psh.GetContainerName(),
+		workflowproj.LabelK8SComponent: psh.GetServiceName(),
+		workflowproj.LabelK8SPartOF:    platform.Name,
+		workflowproj.LabelK8SManagedBy: "sonataflow-operator",
 	}
 	selectorLbl := map[string]string{
 		workflowproj.LabelService: psh.GetServiceName(),

controllers/profiles/common/object_creators_test.go

@@ -39,6 +39,8 @@ import (
 	"github.com/apache/incubator-kie-kogito-serverless-operator/workflowproj"
 )
 
+const platformName = "test-platform"
+
 func Test_ensureWorkflowPropertiesConfigMapMutator(t *testing.T) {
 	workflow := test.GetBaseSonataFlowWithDevProfile(t.Name())
 	platform := test.GetBasePlatform()

workflowproj/operator.go

@@ -40,7 +40,11 @@ const (
 	// LabelService key to use among object selectors
 	LabelService = metadata.Domain + "/service"
 	// LabelWorkflow specialized label managed by the controller
-	LabelWorkflow = metadata.Domain + "/workflow-app"
+	LabelWorkflow     = metadata.Domain + "/workflow-app"
+	LabelK8SName      = "app.kubernetes.io/name"
+	LabelK8SComponent = "app.kubernetes.io/component"
+	LabelK8SPartOF    = "app.kubernetes.io/part-of"
+	LabelK8SManagedBy = "app.kubernetes.io/managed-by"
 )
 
 // SetTypeToObject sets the Kind and ApiVersion to a given object since the default constructor won't do it.
@@ -84,10 +88,18 @@ func GetManagedPropertiesFileName(workflow *operatorapi.SonataFlow) string {
 
 // GetDefaultLabels gets the default labels based on the given workflow.
 func GetDefaultLabels(workflow *operatorapi.SonataFlow) map[string]string {
-	return map[string]string{
-		LabelApp:      workflow.Name,
-		LabelWorkflow: workflow.Name,
+	labels := map[string]string{
+		LabelApp:          workflow.Name,
+		LabelWorkflow:     workflow.Name,
+		LabelK8SName:      workflow.Name,
+		LabelK8SComponent: "serverless-workflow",
+		LabelK8SManagedBy: "sonataflow-operator",
 	}
+	if workflow.Status.Platform != nil {
+		labels[LabelK8SPartOF] = workflow.Status.Platform.Name
+	}
+	return labels
+
 }
 
 // SetMergedLabels adds the merged labels to the given object.