useragent

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Parse user agent strings into structured data based on BrowserScope data

UserAgent filter, adds information about user agent like family, operating system, version, and device

Logstash releases ship with the regexes.yaml database made available from ua-parser with an Apache 2.0 license. For more details on ua-parser, see https://github.com/tobie/ua-parser/.

 

Synopsis

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This plugin supports the following configuration options:

Required configuration options:

useragent {
    source => ...
}

Available configuration options:

Setting Input type Required Default value

add_field

hash

No

{}

add_tag

array

No

[]

lru_cache_size

number

No

1000

periodic_flush

boolean

No

false

prefix

string

No

""

regexes

string

No

remove_field

array

No

[]

remove_tag

array

No

[]

source

string

Yes

target

string

No

Details

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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 {
      useragent {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }
    # You can also add multiple fields at once:
    filter {
      useragent {
        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 {
      useragent {
        add_tag => [ "foo_%{somefield}" ]
      }
    }
    # You can also add multiple tags at once:
    filter {
      useragent {
        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).

lru_cache_size

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  • Value type is number
  • Default value is 1000

UA parsing is surprisingly expensive. This filter uses an LRU cache to take advantage of the fact that user agents are often found adjacent to one another in log files and rarely have a random distribution. The higher you set this the more likely an item is to be in the cache and the faster this filter will run. However, if you set this too high you can use more memory than desired.

Experiment with different values for this option to find the best performance for your dataset.

This MUST be set to a value > 0. There is really no reason to not want this behavior, the overhead is minimal and the speed gains are large.

It is important to note that this config value is global. That is to say all instances of the user agent filter share the same cache. The last declared cache size will win. The reason for this is that there would be no benefit to having multiple caches for different instances at different points in the pipeline, that would just increase the number of cache misses and waste memory.

periodic_flush

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  • Value type is boolean
  • Default value is false

Call the filter flush method at regular interval. Optional.

prefix

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  • Value type is string
  • Default value is ""

A string to prepend to all of the extracted keys

regexes

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

regexes.yaml file to use

If not specified, this will default to the regexes.yaml that ships with logstash.

You can find the latest version of this here: https://github.com/tobie/ua-parser/blob/master/regexes.yaml

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 {
      useragent {
        remove_field => [ "foo_%{somefield}" ]
      }
    }
    # You can also remove multiple fields at once:
    filter {
      useragent {
        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 {
      useragent {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }
    # You can also remove multiple tags at once:
    filter {
      useragent {
        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.

source

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  • This is a required setting.
  • Value type is string
  • There is no default value for this setting.

The field containing the user agent string. If this field is an array, only the first value will be used.

target

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

The name of the field to assign user agent data into.

If not specified user agent data will be stored in the root of the event.