Enable Prometheus metrics for deployed Ingresses

app/models/clusters/applications/ingress.rb

@@ -17,8 +17,12 @@ module Clusters
         'stable/nginx-ingress'
       end
 
+      def chart_values_file
+        "#{Rails.root}/vendor/#{name}/values.yaml"
+      end
+
       def install_command
-        Gitlab::Kubernetes::Helm::InstallCommand.new(name, chart: chart)
+        Gitlab::Kubernetes::Helm::InstallCommand.new(name, chart: chart, chart_values_file: chart_values_file)
       end
     end
   end

changelogs/unreleased/39985-enable-prometheus-metrics-for-deployed-ingresses.yml

+---
+title: Enable Prometheus metrics for deployed Ingresses
+merge_request: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16866
+author: joshlambert
+type: changed

lib/gitlab/kubernetes/helm/pod.rb

@@ -64,7 +64,7 @@ module Gitlab
             {
               name: 'configuration-volume',
               configMap: {
-                name: 'values-content-configuration',
+                name: "values-content-configuration-#{command.name}",
                 items: [{ key: 'values', path: 'values.yaml' }]
               }
             }
@@ -81,7 +81,11 @@ module Gitlab
 
         def create_config_map
           resource = ::Kubeclient::Resource.new
-          resource.metadata = { name: 'values-content-configuration', namespace: namespace_name, labels: { name: 'values-content-configuration' } }
+          resource.metadata = {
+            name: "values-content-configuration-#{command.name}",
+            namespace: namespace_name,
+            labels: { name: "values-content-configuration-#{command.name}" }
+          }
           resource.data = { values: File.read(command.chart_values_file) }
           kubeclient.create_config_map(resource)
         end

spec/lib/gitlab/kubernetes/helm/pod_spec.rb

@@ -63,14 +63,14 @@ describe Gitlab::Kubernetes::Helm::Pod do
 
       it 'should mount configMap specification in the volume' do
         spec = subject.generate.spec
-        expect(spec.volumes.first.configMap['name']).to eq('values-content-configuration')
+        expect(spec.volumes.first.configMap['name']).to eq("values-content-configuration-#{app.name}")
         expect(spec.volumes.first.configMap['items'].first['key']).to eq('values')
         expect(spec.volumes.first.configMap['items'].first['path']).to eq('values.yaml')
       end
     end
 
     context 'without a configuration file' do
-      let(:app) { create(:clusters_applications_ingress, cluster: cluster) }
+      let(:app) { create(:clusters_applications_helm, cluster: cluster) }
 
       it_behaves_like 'helm pod'
 

vendor/ingress/values.yaml

+controller:
+  image:
+    tag: "0.10.2"
+    repository: "quay.io/kubernetes-ingress-controller/nginx-ingress-controller"
+  stats.enabled: true
+  podAnnotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "10254"