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range

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range

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This is a community-maintained plugin! It does not ship with Logstash by default, but it is easy to install by running bin/logstash-plugin install logstash-filter-range.

This filter is used to check that certain fields are within expected size/length ranges. Supported types are numbers and strings. Numbers are checked to be within numeric value range. Strings are checked to be within string length range. More than one range can be specified for same fieldname, actions will be applied incrementally. When field value is within a specified range an action will be taken. Supported actions are drop event, add tag, or add field with specified value.

Example use cases are for histogram-like tagging of events or for finding anomaly values in fields or too big events that should be dropped.

Synopsis

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This plugin supports the following configuration options:

Required configuration options:

range {
}

Available configuration options:

Setting	Input type	Required	Default value
`add_field`	hash	No	`{}`
`add_tag`	array	No	`[]`
`negate`	boolean	No	`false`
`periodic_flush`	boolean	No	`false`
`ranges`	array	No	`[]`
`remove_field`	array	No	`[]`
`remove_tag`	array	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 {
      range {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }
[source,ruby]
    # You can also add multiple fields at once:
    filter {
      range {
        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 {
      range {
        add_tag => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also add multiple tags at once:
    filter {
      range {
        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).

`negate`

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Value type is boolean
Default value is false

Negate the range match logic, events should be outsize of the specified range to match.

`periodic_flush`

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Value type is boolean
Default value is false

Call the filter flush method at regular interval. Optional.

`ranges`

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Value type is array
Default value is []

An array of field, min, max, action tuples. Example:

    filter {
      range {
        ranges => [ "message", 0, 10, "tag:short",
                    "message", 11, 100, "tag:medium",
                    "message", 101, 1000, "tag:long",
                    "message", 1001, 100000, "drop",
                    "duration", 0, 100, "field:latency:fast",
                    "duration", 101, 200, "field:latency:normal",
                    "duration", 201, 1000, "field:latency:slow",
                    "duration", 1001, 100000, "field:latency:outlier",
                    "requests", 0, 10, "tag:too_few_%{host}_requests" ]
      }
    }

Supported actions are drop tag or field with specified value. Added tag names and field names and field values can have %{dynamic} values.

`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 {
      range {
        remove_field => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also remove multiple fields at once:
    filter {
      range {
        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 {
      range {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also remove multiple tags at once:
    filter {
      range {
        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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