IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Clone filter plugin

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Clone filter plugin

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Plugin version: v4.2.0
Released on: 2021-11-10
Changelog

For other versions, see the Versioned plugin docs.

Getting Help

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For questions about the plugin, open a topic in the Discuss forums. For bugs or feature requests, open an issue in Github. For the list of Elastic supported plugins, please consult the Elastic Support Matrix.

Description

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The clone filter is for duplicating events. A clone will be created for each type in the clone list. The original event is left unchanged and a type field is added to the clone. Created events are inserted into the pipeline as normal events and will be processed by the remaining pipeline configuration starting from the filter that generated them (i.e. this plugin).

Event Metadata and the Elastic Common Schema (ECS)

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This plugin adds a tag to a cloned event. By default, the tag is stored in the type field. When ECS is enabled, the tag is stored in the tags array field.

Here’s how ECS compatibility mode affects output.

ECS disabled	ECS `v1`, `v8`	Availability	Description
type	tags	Always	a tag of cloned event

Clone Filter Configuration Options

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This plugin supports the following configuration options plus the Common Options described later.

Setting	Input type	Required
`clones`	array	Yes
`ecs_compatibility`	string	No

Also see Common Options for a list of options supported by all filter plugins.

`clones`

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This is a required setting.
Value type is array
There is no default value for this setting.
a new clone will be created with a type of the given value in this list when ECS is disabled
a new clone will be created with a tags of the given value in this list when ECS is enabled

Note: setting an empty array will not create any clones. A warning message is logged.

`ecs_compatibility`

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Value type is string
Supported values are:
- disabled: does not use ECS-compatible field names
- v1, v8: uses fields that are compatible with Elastic Common Schema
Default value depends on which version of Logstash is running:
- When Logstash provides a pipeline.ecs_compatibility setting, its value is used as the default
- Otherwise, the default value is disabled.

Controls this plugin’s compatibility with the Elastic Common Schema (ECS). The value of this setting affects the behavior of the clones

Example:

    filter {
      clone {
        clones => ["sun", "moon"]
      }
    }

ECS disabled

{
      "@version" => "1",
      "sequence" => 0,
       "message" => "Hello World!",
    "@timestamp" => 2021-03-24T11:20:36.226Z,
          "host" => "example.com"
}
{
      "@version" => "1",
      "sequence" => 0,
       "message" => "Hello World!",
    "@timestamp" => 2021-03-24T11:20:36.226Z,
          "type" => "sun",
          "host" => "example.com"
}
{
      "@version" => "1",
      "sequence" => 0,
       "message" => "Hello World!",
    "@timestamp" => 2021-03-24T11:20:36.226Z,
          "type" => "moon",
          "host" => "example.com"
}

ECS enabled

{
      "sequence" => 0,
    "@timestamp" => 2021-03-23T20:25:10.042Z,
       "message" => "Hello World!",
      "@version" => "1",
          "host" => "example.com"
}
{
          "tags" => [
        [0] "sun"
    ],
      "sequence" => 0,
    "@timestamp" => 2021-03-23T20:25:10.042Z,
       "message" => "Hello World!",
      "@version" => "1",
          "host" => "example.com"
}
{
          "tags" => [
        [0] "moon"
    ],
      "sequence" => 0,
    "@timestamp" => 2021-03-23T20:25:10.042Z,
       "message" => "Hello World!",
      "@version" => "1",
          "host" => "example.com"
}

Common Options

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The following configuration options are supported by all filter plugins:

Setting	Input type	Required
`add_field`	hash	No
`add_tag`	array	No
`enable_metric`	boolean	No
`id`	string	No
`periodic_flush`	boolean	No
`remove_field`	array	No
`remove_tag`	array	No

`add_field`

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Value type is hash
Default value is {}

If this filter is successful, add any arbitrary fields to this event. Field names can be dynamic and include parts of the event using the %{field}.

Example:

    filter {
      clone {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }

    # You can also add multiple fields at once:
    filter {
      clone {
        add_field => {
          "foo_%{somefield}" => "Hello world, from %{host}"
          "new_field" => "new_static_value"
        }
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add field foo_hello if it is present, with the value above and the %{host} piece replaced with that value from the event. The second example would also add a hardcoded field.

`add_tag`

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Value type is array
Default value is []

If this filter is successful, add arbitrary tags to the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      clone {
        add_tag => [ "foo_%{somefield}" ]
      }
    }

    # You can also add multiple tags at once:
    filter {
      clone {
        add_tag => [ "foo_%{somefield}", "taggedy_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add a tag foo_hello (and the second example would of course add a taggedy_tag tag).

`enable_metric`

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Value type is boolean
Default value is true

Disable or enable metric logging for this specific plugin instance. By default we record all the metrics we can, but you can disable metrics collection for a specific plugin.

`id`

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Value type is string
There is no default value for this setting.

Add a unique ID to the plugin configuration. If no ID is specified, Logstash will generate one. It is strongly recommended to set this ID in your configuration. This is particularly useful when you have two or more plugins of the same type, for example, if you have 2 clone filters. Adding a named ID in this case will help in monitoring Logstash when using the monitoring APIs.

    filter {
      clone {
        id => "ABC"
      }
    }

Variable substitution in the id field only supports environment variables and does not support the use of values from the secret store.

`periodic_flush`

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Value type is boolean
Default value is false

Call the filter flush method at regular interval. Optional.

`remove_field`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary fields from this event. Fields names can be dynamic and include parts of the event using the %{field} Example:

    filter {
      clone {
        remove_field => [ "foo_%{somefield}" ]
      }
    }

    # You can also remove multiple fields at once:
    filter {
      clone {
        remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the field with name foo_hello if it is present. The second example would remove an additional, non-dynamic field.

`remove_tag`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary tags from the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      clone {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }

    # You can also remove multiple tags at once:
    filter {
      clone {
        remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the tag foo_hello if it is present. The second example would remove a sad, unwanted tag as well.

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