Record Modifier
The Record Modifier Filter plugin allows to append fields or to exclude specific fields.

Configuration Parameters

The plugin supports the following configuration parameters: Remove_key and Allowlist_key are exclusive.
Key
Description
Record
Append fields. This parameter needs key and value pair.
Remove_key
If the key is matched, that field is removed.
Allowlist_key
If the key is not matched, that field is removed.
Whitelist_key
An alias of Allowlist_key for backwards compatibility.

Getting Started

In order to start filtering records, you can run the filter from the command line or through the configuration file.
This is a sample in_mem record to filter.
{"Mem.total"=>1016024, "Mem.used"=>716672, "Mem.free"=>299352, "Swap.total"=>2064380, "Swap.used"=>32656, "Swap.free"=>2031724}

Append fields

The following configuration file is to append product name and hostname (via environment variable) to record.
[INPUT]
Name mem
Tag mem.local
[OUTPUT]
Name stdout
Match *
[FILTER]
Name record_modifier
Match *
Record hostname ${HOSTNAME}
Record product Awesome_Tool
You can also run the filter from command line.
$ fluent-bit -i mem -o stdout -F record_modifier -p 'Record=hostname ${HOSTNAME}' -p 'Record=product Awesome_Tool' -m '*'
The output will be
[0] mem.local: [1492436882.000000000, {"Mem.total"=>1016024, "Mem.used"=>716672, "Mem.free"=>299352, "Swap.total"=>2064380, "Swap.used"=>32656, "Swap.free"=>2031724, "hostname"=>"localhost.localdomain", "product"=>"Awesome_Tool"}]

Remove fields with Remove_key

The following configuration file is to remove 'Swap.*' fields.
[INPUT]
Name mem
Tag mem.local
[OUTPUT]
Name stdout
Match *
[FILTER]
Name record_modifier
Match *
Remove_key Swap.total
Remove_key Swap.used
Remove_key Swap.free
You can also run the filter from command line.
$ fluent-bit -i mem -o stdout -F record_modifier -p 'Remove_key=Swap.total' -p 'Remove_key=Swap.free' -p 'Remove_key=Swap.used' -m '*'
The output will be
[0] mem.local: [1492436998.000000000, {"Mem.total"=>1016024, "Mem.used"=>716672, "Mem.free"=>295332}]

Remove fields with Allowlist_key

The following configuration file is to remain 'Mem.*' fields.
[INPUT]
Name mem
Tag mem.local
[OUTPUT]
Name stdout
Match *
[FILTER]
Name record_modifier
Match *
Allowlist_key Mem.total
Allowlist_key Mem.used
Allowlist_key Mem.free
You can also run the filter from command line.
$ fluent-bit -i mem -o stdout -F record_modifier -p 'Allowlist_key=Mem.total' -p 'Allowlist_key=Mem.free' -p 'Allowlist_key=Mem.used' -m '*'
The output will be
[0] mem.local: [1492436998.000000000, {"Mem.total"=>1016024, "Mem.used"=>716672, "Mem.free"=>295332}]
Last modified 1mo ago
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Outline
Configuration Parameters
Getting Started
Append fields
Remove fields with Remove_key
Remove fields with Allowlist_key