https://docs.servicenow.com/bundle/tokyo-application-development/page/script/useful-scripts/reference
/r_DisplayFieldMessages.html

In ServiceNow, the gs object provides a range of methods for logging messages on the server side. However, the availability of these methods can vary depending on whether the application is global or scoped.
* gs.info(): This method is available in scoped applications and is used to log informational messages to the system log. It provides a way to record general information during script execution.
Options A (gs.log()), B (gs.print()), and D (gs.debugLog()) are not available in scoped applications. These methods are either restricted to global applications or do not exist in the ServiceNow API.
For more detailed information, refer to the official ServiceNow documentation on server-side scripting: