[docs] Migrate docs from AsciiDoc to Markdown (#17159)

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docs/reference/plugins-codecs-rubydebug.md

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+---
+navigation_title: "rubydebug"
+mapped_pages:
+  - https://www.elastic.co/guide/en/logstash/current/plugins-codecs-rubydebug.html
+---
+
+# Rubydebug codec plugin [plugins-codecs-rubydebug]
+
+
+* Plugin version: v3.1.0
+* Released on: 2020-07-08
+* [Changelog](https://github.com/logstash-plugins/logstash-codec-rubydebug/blob/v3.1.0/CHANGELOG.md)
+
+For other versions, see the [Versioned plugin docs](logstash-docs://docs/reference/codec-rubydebug-index.md).
+
+## Getting help [_getting_help_197]
+
+For questions about the plugin, open a topic in the [Discuss](http://discuss.elastic.co) forums. For bugs or feature requests, open an issue in [Github](https://github.com/logstash-plugins/logstash-codec-rubydebug). For the list of Elastic supported plugins, please consult the [Elastic Support Matrix](https://www.elastic.co/support/matrix#logstash_plugins).
+
+
+## Description [_description_196]
+
+The rubydebug codec will output your Logstash event data using the Ruby Amazing Print library.
+
+
+## Rubydebug Codec Configuration Options [plugins-codecs-rubydebug-options]
+
+| Setting | Input type | Required |
+| --- | --- | --- |
+| [`metadata`](#plugins-codecs-rubydebug-metadata) | [boolean](/reference/configuration-file-structure.md#boolean) | No |
+
+ 
+
+### `metadata` [plugins-codecs-rubydebug-metadata]
+
+* Value type is [boolean](/reference/configuration-file-structure.md#boolean)
+* Default value is `false`
+
+Should the event’s metadata be included?
+
+
+