diff --git a/app/controllers/hot_controller.rb b/app/controllers/hot_controller.rb
index 931c758..7f075e5 100644
--- a/app/controllers/hot_controller.rb
+++ b/app/controllers/hot_controller.rb
@@ -4,5 +4,8 @@ class HotController < ApplicationController
     logger.info('callee')
     logger.info(__callee__)
     logger.info(__method__)
+
+    # logger.info(ActiveSupport::LogSubscriber.subscribers.map(&:patterns))
+    logger.info(ActiveSupport::Notifications.notifier.listeners_for('.*\.action_controller'))
   end
 end
diff --git a/lib/monkey_patches/semantic_logger/appenders.rb b/lib/monkey_patches/semantic_logger/appenders.rb
new file mode 100644
index 0000000..267bdd7
--- /dev/null
+++ b/lib/monkey_patches/semantic_logger/appenders.rb
@@ -0,0 +1,19 @@
+module SemanticLogger
+  # Manage a collection of appenders.
+  class Appenders < Concurrent::Array
+    def close
+      closed_appenders = []
+      each do |appender|
+        logger.trace "Closing appender: #{appender.name}"
+        closed_appenders << appender
+        appender.flush
+        appender.close
+      rescue Exception => e
+        logger.error "Failed to close appender: #{appender.name}", e
+      end
+      # Delete appenders outside the #each above which prevents changes during iteration.
+      closed_appenders.each { |appender| delete(appender) }
+      logger.trace 'All appenders closed and removed from appender list'
+    end
+  end
+end