log

Prints a message, the current record count, and sample records to stderr. The payload passes through unchanged.

Supported formats: json jsonl csv

Options

Option	Type	Required	Description
message	string	No	Text to print before the count and samples
count	boolean	No	Whether to print the record count. Defaults to true.
sample	integer	No	Number of sample records to print. Defaults to 10. Set to 0 to disable.

Example

- log:
    message: After normalization
    count: true
    sample: 5

Notes

• sample: 0 (or a negative value) disables sample output.
• Useful as a debugging checkpoint between steps.
• The payload is not modified — log is a read-only inspection step.