diff --git a/app/models/fluentd/setting/in_tail.rb b/app/models/fluentd/setting/in_tail.rb
index 855f222..89de568 100644
--- a/app/models/fluentd/setting/in_tail.rb
+++ b/app/models/fluentd/setting/in_tail.rb
@@ -31,43 +31,6 @@ class Fluentd
         end
       end
 
-      def extra_format_options
-        self.class.known_formats[format.to_sym] || []
-      end
-
-      def format_specific_conf
-        return "" if %w(grok regexp).include?(format)
-
-        indent = " " * 2
-        format_specific_conf = ""
-
-        if format.to_sym == :multiline
-          known_formats[:multiline].each do |key|
-            value = send(key)
-            if value.present?
-              format_specific_conf << "#{indent}#{key} /#{value}/\n"
-            end
-          end
-        else
-          extra_format_options.each do |key|
-            format_specific_conf << "#{indent}#{key} #{send(key)}\n"
-          end
-        end
-
-        format_specific_conf
-      end
-
-      def certain_format_line
-        case format
-        when "grok"
-          "format /#{grok.convert_to_regexp(grok_str).source.gsub("/", "\\/")}/ # grok: '#{grok_str}'"
-        when "regexp"
-          "format /#{regexp}/"
-        else
-          "format #{format}"
-        end
-      end
-
       def grok
         @grok ||=
           begin