Include active user count in Users over License

Remove additional text if current user count exceeds historical.

ee/app/helpers/license_helper.rb

@@ -18,6 +18,10 @@ module LicenseHelper
     HistoricalData.max_historical_user_count
   end
 
+  def current_active_user_count
+    License.current&.current_active_users_count || 0
+  end
+
   def license_message(signed_in: signed_in?, is_admin: current_user&.admin?)
     return unless current_license
     return unless signed_in

ee/app/views/admin/licenses/_breakdown.html.haml

@@ -6,9 +6,9 @@
 - else
   - licensed_users = 'Unlimited'
 
-- historical = max_historical_user_count
-- if historical && restricted && historical > restricted
-  - users_over_license = historical - restricted
+- maximum_user_count = [max_historical_user_count, current_active_user_count].max
+- if restricted && maximum_user_count > restricted
+  - users_over_license = maximum_user_count - restricted
 - else
   - users_over_license = 0
 
@@ -37,10 +37,10 @@
         .well-segment.well-centered
           %h3.center
             Maximum Users:
-            = number_with_delimiter historical
+            = number_with_delimiter maximum_user_count
           %hr
-            This is the highest peak of users on your installation since the license started, and this is the minimum
-            number you need to purchase when you renew your license.
+            This is the highest peak of users on your installation since the license started, and
+            this is the minimum number you need to purchase when you renew your license.
     .col-sm-4
       .info-well.dark-well
         .well-segment.well-centered
@@ -52,4 +52,4 @@
             %a{ href: 'https://about.gitlab.com/licensing-faq/' } true-up model
             has a retroactive charge for these users at the next renewal. If you want to update your
             license sooner to prevent this, please contact
-            #{mail_to 'renewals@gitlab.com'}.
+            %a{ href: 'https://support.gitlab.com' } Support.

ee/changelogs/unreleased/8418-maximum-users-should-always-reflect-current-counts.yml

+---
+title: Maximum Users metric in Admin Dashboard includes current active user count
+merge_request: 15810
+author:
+type: added

ee/spec/helpers/license_helper_spec.rb

@@ -68,4 +68,34 @@ describe LicenseHelper do
       expect(guest_user_count).to eq(User.active.count - User.active.excluding_guests.count)
     end
   end
+
+  describe '#max_historical_user_count' do
+    it 'returns the max historical user count' do
+      count = 5
+      expect(HistoricalData).to receive(:max_historical_user_count).and_return(count)
+
+      expect(max_historical_user_count).to eq(count)
+    end
+  end
+
+  describe '#current_active_user_count' do
+    context 'when current license is set' do
+      it 'returns the current_active_users_count for the current license' do
+        license = double
+        allow(License).to receive(:current).and_return(license)
+        count = 5
+        allow(license).to receive(:current_active_users_count).and_return(count)
+
+        expect(current_active_user_count).to eq(count)
+      end
+    end
+
+    context 'when current license is not set' do
+      it 'returns 0' do
+        allow(License).to receive(:current).and_return(nil)
+
+        expect(current_active_user_count).to eq(0)
+      end
+    end
+  end
 end