Fluent Bit: Official Manual
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4.0
  • Fluent Bit Documentation
  • About
    • What is Fluent Bit?
    • A Brief History of Fluent Bit
    • Fluentd and Fluent Bit
    • License
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    • Key Concepts
    • Buffering
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      • YAML Configuration
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  • Stream Processing
    • Introduction to Stream Processing
    • Overview
    • Changelog
    • Getting Started
      • Fluent Bit + SQL
      • Check Keys and NULL values
      • Hands On 101
  • Fluent Bit for Developers
    • C Library API
    • Ingest Records Manually
    • Golang Output Plugins
    • WASM Filter Plugins
    • WASM Input Plugins
    • Developer guide for beginners on contributing to Fluent Bit
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  1. Data Pipeline
  2. Filters

Expect

Testing records to ensure they contain an expected key and values

Last updated 4 days ago

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The expect filter plugin lets you validate that records match certain criteria in their structure, like validating that a key exists or it has a specific value.

For a detailed explanation of its usage and use cases, see .

Configuration parameters

The plugin supports the following configuration parameters:

Property
Description

key_exists

Check if a key with a given name exists in the record.

key_not_exists

Check if a key doesn't exist in the record.

key_val_is_null

Check that the value of the key is NULL.

key_val_is_not_null

Check that the value of the key is NOT NULL.

key_val_eq

Check that the value of the key equals the given value in the configuration.

action

Action to take when a rule doesn't match. Available options are warn , exit or result_key. On warn, a warning message is sent to the logging layer when a mismatch of the key* rules is found. Using exit makes Fluent Bit exit with status code 255. result_key adds a matching result to each record.

result_key

Specify a key name for the matching result added when action is set to result_key.

Validating and your Data and Structure