FEATURE: Create new helper method 'Discourse.stats' (#7388)

lib/discourse.rb

@@ -468,6 +468,10 @@ module Discourse
     end
   end
 
+  def self.stats
+    @stats ||= PluginStore.new("stats")
+  end
+
   def self.current_user_provider
     @current_user_provider || Auth::DefaultCurrentUserProvider
   end

lib/s3_inventory.rb

@@ -65,7 +65,7 @@ class S3Inventory
             log "#{missing_count} of #{uploads.count} #{model.name.underscore.pluralize} are missing"
           end
 
-          $redis.set("missing_s3_#{model.table_name}", missing_count)
+          Discourse.stats.set("missing_s3_#{model.table_name}", missing_count)
         ensure
           connection.exec("DROP TABLE #{table_name}") unless connection.nil?
         end

spec/components/s3_inventory_spec.rb

@@ -75,7 +75,7 @@ describe "S3Inventory" do
     end
 
     expect(output).to eq("#{upload.url}\n1 of 4 uploads are missing\n")
-    expect($redis.get("missing_s3_uploads")).to eq("1")
+    expect(Discourse.stats.get("missing_s3_uploads")).to eq(1)
   end
 
   it "should backfill etags to uploads table correctly" do