Make a default namespace of Kubernetes service to contain project ID

app/models/project_services/kubernetes_service.rb

@@ -36,7 +36,7 @@ class KubernetesService < DeploymentService
   def initialize_properties
     if properties.nil?
       self.properties = {}
-      self.namespace = project.path if project.present?
+      self.namespace = "#{project.path}-#{project.id}" if project.present?
     end
   end
 

changelogs/unreleased/28516-default-kubernetes-namespace.yml

+---
+title: Make a default namespace of Kubernetes service to contain project ID
+merge_request:
+author:

spec/models/project_services/kubernetes_service_spec.rb

@@ -74,8 +74,10 @@ describe KubernetesService, models: true, caching: true do
 
   describe '#initialize_properties' do
     context 'with a project' do
-      it 'defaults to the project name' do
-        expect(described_class.new(project: project).namespace).to eq(project.name)
+      let(:namespace_name) { "#{project.path}-#{project.id}" }
+
+      it 'defaults to the project name with ID' do
+        expect(described_class.new(project: project).namespace).to eq(namespace_name)
       end
     end