:plugin: uuid
:type: filter

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:version: %VERSION%
:release_date: %RELEASE_DATE%
:changelog_url: %CHANGELOG_URL%
:include_path: ../../../../logstash/docs/include
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[id="plugins-{type}-{plugin}"]

=== Uuid filter plugin

include::{include_path}/plugin_header.asciidoc[]

==== Description

The uuid filter allows you to generate a
https://en.wikipedia.org/wiki/Universally_unique_identifier[UUID]
and add it as a field to each processed event.

This is useful if you need to generate a string that's unique for every
event, even if the same input is processed multiple times. If you want
to generate strings that are identical each time a event with a given
content is processed (i.e. a hash) you should use the
<<plugins-filters-fingerprint,fingerprint filter>> instead.

The generated UUIDs follow the version 4 definition in
https://tools.ietf.org/html/rfc4122[RFC 4122]) and will be
represented as a standard hexadecimal string format, e.g.
"e08806fe-02af-406c-bbde-8a5ae4475e57".

[id="plugins-{type}s-{plugin}-options"]
==== Uuid Filter Configuration Options

This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> described later.

[cols="<,<,<",options="header",]
|=======================================================================
|Setting |Input type|Required
| <<plugins-{type}s-{plugin}-overwrite>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-target>> |<<string,string>>|Yes
|=======================================================================

Also see <<plugins-{type}s-{plugin}-common-options>> for a list of options supported by all
filter plugins.

&nbsp;

[id="plugins-{type}s-{plugin}-overwrite"]
===== `overwrite` 

  * Value type is <<boolean,boolean>>
  * Default value is `false`

If the value in the field currently (if any) should be overridden
by the generated UUID. Defaults to `false` (i.e. if the field is
present, with ANY value, it won't be overridden)

Example:
[source,ruby]
   filter {
      uuid {
        target    => "uuid"
        overwrite => true
      }
   }

[id="plugins-{type}s-{plugin}-target"]
===== `target` 

  * This is a required setting.
  * Value type is <<string,string>>
  * There is no default value for this setting.

Select the name of the field where the generated UUID should be
stored.

Example:
[source,ruby]
    filter {
      uuid {
        target => "uuid"
      }
    }



[id="plugins-{type}s-{plugin}-common-options"]
include::{include_path}/{type}.asciidoc[]