Add instance_statistics_visibility_private application setting and top nav icon

app/controllers/instance_statistics/application_controller.rb

@@ -7,6 +7,6 @@ class InstanceStatistics::ApplicationController < ApplicationController
   end
 
   def authenticate_user!
-    render_404 unless current_user.admin?
+    render_404 if ApplicationSettingsHelper.hide_instance_statistics?(current_user)
   end
 end

app/helpers/application_settings_helper.rb

@@ -16,6 +16,10 @@ module ApplicationSettingsHelper
     Gitlab::CurrentSettings.enabled_git_access_protocol.present?
   end
   
+  def hide_instance_statistics?(user = current_user)
+    Gitlab::CurrentSettings.instance_statistics_visibility_private? && !user.admin?
+  end
+
   def enabled_protocol
     case Gitlab::CurrentSettings.enabled_git_access_protocol
     when 'http'
@@ -247,6 +251,7 @@ module ApplicationSettingsHelper
       :unique_ips_limit_per_user,
       :unique_ips_limit_time_window,
       :usage_ping_enabled,
+      :instance_statistics_visibility_private,
       :user_default_external,
       :user_oauth_applications,
       :version_check_enabled,

app/models/application_setting.rb

@@ -290,6 +290,7 @@ class ApplicationSetting < ActiveRecord::Base
       user_default_external: false,
       polling_interval_multiplier: 1,
       usage_ping_enabled: Settings.gitlab['usage_ping_enabled'],
+      instance_statistics_visibility_private: false,
       gitaly_timeout_fast: 10,
       gitaly_timeout_medium: 30,
       gitaly_timeout_default: 55,

app/views/admin/application_settings/_usage.html.haml

@@ -30,6 +30,9 @@
             form. For more information, see the documentation on
             = succeed '.' do
               = link_to 'deactivating the usage ping', help_page_path('user/admin_area/settings/usage_statistics', anchor: 'deactivate-the-usage-ping')
+    .form-group
+      = f.label :instance_statistics_visibility_private, 'Instance Statistics visibility'
+      = f.select :instance_statistics_visibility_private, options_for_select({'All users' => false, 'Only admins' => true}, Gitlab::CurrentSettings.instance_statistics_visibility_private?), {}, class: 'form-control'
 
   = f.submit 'Save changes', class: "btn btn-success"
 

app/views/layouts/nav/_dashboard.html.haml

@@ -70,6 +70,10 @@
     = nav_link(controller: 'admin/dashboard') do
       = link_to admin_root_path, class: 'admin-icon qa-admin-area-link', title: _('Admin area'), aria: { label: _("Admin area") }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
         = sprite_icon('admin', size: 18)
+  - unless hide_instance_statistics?
+    = nav_link(controller: :instance_statistics) do
+      = link_to instance_statistics_root_path, title: 'Instance statistics', aria: { label: 'Instance statistics' }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
+        = sprite_icon('chart', size: 18)
   - if Gitlab::Sherlock.enabled?
     %li
       = link_to sherlock_transactions_path, class: 'admin-icon', title: _('Sherlock Transactions'),

db/migrate/20180718005113_add_instance_statistics_visibility_to_application_setting.rb

+class AddInstanceStatisticsVisibilityToApplicationSetting < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default(:application_settings, :instance_statistics_visibility_private,
+                            :boolean,
+                            default: false,
+                            allow_null: false)
+  end
+
+  def down
+    remove_column(:application_settings, :instance_statistics_visibility_private)
+  end
+end