prune
editprune
editThis 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-prune
.
The prune filter is for removing fields from events based on whitelists or blacklist of field names or their values (names and values can also be regular expressions).
This can e.g. be useful if you have a json or kv filter that creates a number of fields with names that you don’t necessarily know the names of beforehand, and you only want to keep a subset of them.
Synopsis
editThis plugin supports the following configuration options:
Required configuration options:
prune { }
Available configuration options:
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No |
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No |
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No |
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Details
edit
add_field
edit- 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 { prune { add_field => { "foo_%{somefield}" => "Hello world, from %{host}" } } } [source,ruby] # You can also add multiple fields at once: filter { prune { 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
edit- 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 { prune { add_tag => [ "foo_%{somefield}" ] } } [source,ruby] # You can also add multiple tags at once: filter { prune { 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).
blacklist_names
edit- Value type is array
-
Default value is
["%{[^}]+}"]
Exclude fields whose names match specified regexps, by default exclude unresolved %{field}
strings.
filter { prune { blacklist_names => [ "method", "(referrer|status)", "${some}_field" ] } }
blacklist_values
edit- Value type is hash
-
Default value is
{}
Exclude specified fields if their values match one of the supplied regular expressions. In case field values are arrays, each array item is matched against the regular expressions and matching array items will be excluded.
filter { prune { blacklist_values => [ "uripath", "/index.php", "method", "(HEAD|OPTIONS)", "status", "^[^2]" ] } }
interpolate
edit- Value type is boolean
-
Default value is
false
Trigger whether configuration fields and values should be interpolated for dynamic values. Probably adds some performance overhead. Defaults to false.
periodic_flush
edit- Value type is boolean
-
Default value is
false
Call the filter flush method at regular interval. Optional.
remove_field
edit- 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 { prune { remove_field => [ "foo_%{somefield}" ] } } [source,ruby] # You can also remove multiple fields at once: filter { prune { 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
edit- 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 { prune { remove_tag => [ "foo_%{somefield}" ] } } [source,ruby] # You can also remove multiple tags at once: filter { prune { 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.
whitelist_names
edit- Value type is array
-
Default value is
[]
Include only fields only if their names match specified regexps, default to empty list which means include everything.
filter { prune { whitelist_names => [ "method", "(referrer|status)", "${some}_field" ] } }
whitelist_values
edit- Value type is hash
-
Default value is
{}
Include specified fields only if their values match one of the supplied regular expressions. In case field values are arrays, each array item is matched against the regular expressions and only matching array items will be included.
filter { prune { whitelist_values => [ "uripath", "/index.php", "method", "(GET|POST)", "status", "^[^2]" ] } }