Installation of Splunk Addon for ServiceNow

http://docs.splunk.com/Documentation/AddOns/released/ServiceNow/Install

Splunk Integration steps with ServiceNow - Fuji and Eureka Versions

Why do we need to integrate ServiceNow with Splunk?

If you want to enable users to create incidents and events in ServiceNow using the custom generating search commands, custom streaming search commands, or alert-triggered scripts, you must integrate ServiceNow with your Splunk platform instances.

Note: performing push integration with events, ensure that you have the Event Management plugin installed and enabled before you proceed

The below document from the splunk will give step by step instructions for integrating Splunk with ServiceNow

The link to the document is here

How to debug the Business Rules or UI Action scripts in ServiceNow

Step1:
Where ever required put the gs.print() or gs.log() statements in the scripts

Step2 - From the SNOW wiki

System Diagnostics > Debug Log displays gs.print() and gs.log() statements as well as server logging information and error messages at the bottom of the content frame. This helps you avoid alternating between the record you are trying to debug and the log output.