Fix gitlab.com licenses api timeout

User count queries are too expensive on .com so we
return `1` for `User.current_active_users_count` on .com.

ee/app/models/license.rb

@@ -349,6 +349,10 @@ def edition
   end
 
   def current_active_users_count
+    # These count queries are too expensive on .com.
+    # See https://gitlab.com/gitlab-org/gitlab-ee/issues/11534
+    return 1 if Gitlab.com?
+
     @current_active_users_count ||= begin
       if exclude_guests_from_active_count?
         User.active.excluding_guests.count

ee/spec/models/license_spec.rb

@@ -617,6 +617,13 @@ def build_license_with_add_ons(add_ons, plan: nil)
       expect(license.overage).to eq(10)
     end
 
+    it 'returns the difference using current_active_users_count as 1 if Gitlab.com' do
+      expect(Gitlab).to receive(:com?).and_return(true).at_least(:once)
+      allow(license).to receive(:restricted_user_count) { 0 }
+
+      expect(license.overage).to eq(1)
+    end
+
     it 'returns 0 if the difference is a negative number' do
       allow(license).to receive(:restricted_user_count) { 2 }