Made for testing: make sure that your records contain the expected key and values
The expect filter plugin allows you to validate that records match certain criteria in their structure, like validating that a key exists or it has a specific value.
The following page just describes the configuration properties available, for a detailed explanation of its usage and use cases, please refer the following page:
The plugin supports the following configuration parameters:
As mentioned on top, refer to the following page for specific details of usage of this filter:
Property
Description
key_exists
Check if a key with a given name exists in the record.
key_not_exists
Check if a key does not 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 does not match. The available options are warn or exit. On warn, a warning message is sent to the logging layer when a mismatch of the rules above is found; using exit makes Fluent Bit abort with status code 255