From Bright Pattern Documentation
The Log scenario block adds a message to the Scenario Engine log file. This block is intended for debugging and testing purposes only, and it may be removed in production versions of scenarios.
Title text is the name of the instance of the block. Enter a name in the text field and click the Update button at the bottom of the Edit pane. The new name of the block appears in the flowchart.
Text message is the free-form content of the message. You can use scenario variables in the text (e.g., This is a test log message for call from $(item.from) to $(item.to)).
Log Level specifies the Scenario Engine log level where this message will appear.