What is the recommended solution for sending security events from Microsoft Sentinel to Splunk?

The recommended solution for sending security events from Microsoft Sentinel to Splunk is through the use of a Logic App. Logic Apps provide a flexible, scalable way to automate workflows and integrate services, including sending data to external systems like Splunk.

In this context, Logic Apps can be configured to respond to triggers from Microsoft Sentinel, allowing for the seamless forwarding of security events. This functionality is particularly important when organizations need to streamline their security monitoring and response processes by integrating data across different platforms.

While Microsoft Sentinel workbooks provide visualization and reporting capabilities for security data, they are not a mechanism for forwarding events. Azure security policies focus on compliance and security posture management rather than data integration. A custom log forwarding agent could also be used but would generally require more setup and maintenance compared to using a Logic App, making it less favorable for straightforward event transfer.

Therefore, using a Logic App is the most efficient recommended solution for this task.