Correct hot questions

app/controllers/application_controller.rb

@@ -105,12 +105,14 @@ class ApplicationController < ActionController::Base
   end
 
   def pull_hot_questions
-    @hot_questions = Rails.cache.fetch('hot_questions', expires_in: 4.hours) do
-      Post.undeleted.where(updated_at: (Rails.env.development? ? 365 : 7).days.ago..Time.now)
+    @hot_questions = Rails.cache.fetch("#{RequestContext.community_id}/hot_questions", expires_in: 4.hours) do
+      Rack::MiniProfiler.step 'hot_questions: cache miss' do
+        Post.undeleted.where(last_activity: (Rails.env.development? ? 365 : 7).days.ago..Time.now)
             .where(post_type_id: Question.post_type_id).includes(:category)
             .order('score DESC').limit(SiteSetting['HotQuestionsCount'])
       end
     end
+  end
 
   def pull_categories
     @header_categories = Rails.cache.fetch("#{RequestContext.community_id}/header_categories") do