Select deployments that only has the app label

As Auto DevOps deployments both label and annotations, that will be
included in the deploy board so need to warn at all.

ee/app/models/concerns/ee/kubernetes_service.rb

@@ -13,7 +13,7 @@ module EE
         deployments = filter_by_project_environment(data[:deployments], project.full_path_slug, environment.slug)
         pods = filter_by_project_environment(data[:pods], project.full_path_slug, environment.slug) if data[:pods]&.any?
 
-        legacy_deployments = filter_by_label(data[:deployments], { app: environment.slug })
+        legacy_deployments = filter_by_legacy_label(data[:deployments], project.full_path_slug, environment.slug)
 
         ::Gitlab::Kubernetes::RolloutStatus.from_deployments(*deployments, pods: pods, legacy_deployments: legacy_deployments)
       end

lib/gitlab/kubernetes.rb

@@ -43,6 +43,14 @@ module Gitlab
       })
     end
 
+    def filter_by_legacy_label(items, app, env)
+      legacy_items = filter_by_label(items, { app: env })
+
+      non_legacy_items = filter_by_project_environment(legacy_items, app, env)
+
+      legacy_items - non_legacy_items
+    end
+
     # Converts a pod (as returned by the kubernetes API) into a terminal
     def terminals_for_pod(api_url, namespace, pod)
       metadata = pod.fetch("metadata", {})

spec/lib/gitlab/kubernetes_spec.rb

@@ -67,6 +67,30 @@ describe Gitlab::Kubernetes do
     end
   end
 
+  describe '#filter_by_legacy_label' do
+    let(:non_matching_pod) { kube_pod(environment_slug: 'production', project_slug: 'my-cool-app') }
+
+    let(:non_matching_pod_2) do
+      kube_pod(environment_slug: 'production', project_slug: 'my-cool-app').tap do |pod|
+        pod['metadata']['labels']['app'] = 'production'
+      end
+    end
+
+    let(:matching_pod) do
+      kube_pod.tap do |pod|
+        pod['metadata']['annotations'].delete('app.gitlab.com/env')
+        pod['metadata']['annotations'].delete('app.gitlab.com/app')
+        pod['metadata']['labels']['app'] = 'production'
+      end
+    end
+
+    it 'returns matching labels' do
+      items = [non_matching_pod, non_matching_pod_2, matching_pod]
+
+      expect(filter_by_legacy_label(items, 'my-cool-app', 'production')).to contain_exactly(matching_pod)
+    end
+  end
+
   describe '#to_kubeconfig' do
     let(:token) { 'TOKEN' }
     let(:ca_pem) { 'PEM' }