Add environment_scope to enabled partial

app/views/projects/clusters/_banner.html.haml

-%h4= s_('ClusterIntegration|Enable cluster integration')
-.settings-content
+%h4= s_('ClusterIntegration|Cluster integration')
+%p= s_('ClusterIntegration|Control how your cluster integrates with GitLab')
 
+.settings-content
   .hidden.js-cluster-error.alert.alert-danger.alert-block.append-bottom-10{ role: 'alert' }
     = s_('ClusterIntegration|Something went wrong while creating your cluster on Google Kubernetes Engine')
     %p.js-error-reason
@@ -10,12 +11,3 @@
 
   .hidden.js-cluster-success.alert.alert-success.alert-block.append-bottom-10{ role: 'alert' }
     = s_('ClusterIntegration|Cluster was successfully created on Google Kubernetes Engine. Refresh the page to see cluster\'s details')
-
-  %p
-    - if @cluster.enabled?
-      - if can?(current_user, :update_cluster, @cluster)
-        = s_('ClusterIntegration|Cluster integration is enabled for this project. Disabling this integration will not affect your cluster, it will only temporarily turn off GitLab\'s connection to it.')
-      - else
-        = s_('ClusterIntegration|Cluster integration is enabled for this project.')
-    - else
-      = s_('ClusterIntegration|Cluster integration is disabled for this project.')

app/views/projects/clusters/_enabled.html.haml

 = form_for @cluster, url: namespace_project_cluster_path(@project.namespace, @project, @cluster), as: :cluster do |field|
   = form_errors(@cluster)
-  .form-group.append-bottom-20
-    %label.append-bottom-10
+  .form-group
+    %h5= s_('ClusterIntegration|Integration status')
+    %p
+      - if @cluster.enabled?
+        - if can?(current_user, :update_cluster, @cluster)
+          = s_('ClusterIntegration|Cluster integration is enabled for this project. Disabling this integration will not affect your cluster, it will only temporarily turn off GitLab\'s connection to it.')
+        - else
+          = s_('ClusterIntegration|Cluster integration is enabled for this project.')
+      - else
+        = s_('ClusterIntegration|Cluster integration is disabled for this project.')
+    %label
       = field.hidden_field :enabled, { class: 'js-toggle-input'}
 
       %button{ type: 'button',
@@ -12,6 +21,13 @@
           = sprite_icon('status_success_borderless', size: 16, css_class: 'toggle-icon-svg toggle-status-checked')
           = sprite_icon('status_failed_borderless', size: 16, css_class: 'toggle-icon-svg toggle-status-unchecked')
 
+  .form-group
+    %h5= s_('ClusterIntegration|Environment scope')
+    %p
+      = s_("ClusterIntegration|Choose which of your project's environments will use this cluster.")
+      = link_to s_("ClusterIntegration|Learn more about environments"), help_page_path('ci/environments')
+    = field.text_field :environment_scope, class: 'form-control js-select-on-focus', readonly: !has_multiple_clusters?(@project), placeholder: s_('ClusterIntegration|Environment scope')
+
   - if can?(current_user, :update_cluster, @cluster)
     .form-group
-        = field.submit _('Save'), class: 'btn btn-success'
+      = field.submit _('Save changes'), class: 'btn btn-success'

app/views/projects/clusters/show.html.haml

@@ -17,7 +17,7 @@
   .js-cluster-application-notice
     .flash-container
 
-  %section.settings.no-animate.expanded
+  %section.settings.no-animate.expanded#cluster-integration
     = render 'banner'
     = render 'enabled'