- add debug monkeypatching

lib/logstash/monkeypatches-for-debugging.rb

@@ -0,0 +1,10 @@
+if $DEBUGLIST.include?("require")
+  module Kernel
+    alias_method :require_debug, :require
+
+    def require(path)
+      puts "require(\"#{path}\")"
+      return require_debug(path)
+    end
+  end
+end

lib/logstash/runner.rb

@@ -38,6 +38,7 @@ end
 
 require "logstash/monkeypatches-for-performance"
 require "logstash/monkeypatches-for-bugs"
+require "logstash/monkeypatches-for-debugging"
 require "logstash/namespace"
 require "logstash/program"
 require "i18n" # gem 'i18n'