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observe_log

Type: Observe

Reads declared input fields and writes them to the engine's logger. This is a read-only operator: it produces no output fields and does not modify the DataFrame. It is exempt from dead-code detection.

Parameters

Name Type Required Default Description
log_prefix string No "" Prefix prepended to each log line.

Metadata Contract

Field Typical Usage
CommonInput [<fields to observe>]
CommonOutput []
ItemInput [<fields to observe>]
ItemOutput []

DSL Usage

flow.observe_log(
    log_prefix=...,
    common_input=[...],
    item_input=[...],
    item_output=[...],
)