What approach is recommended for analyzing security events across multiple Log Analytics workspaces in Azure Sentinel?

The recommended approach for analyzing security events across multiple Log Analytics workspaces in Azure Sentinel is to utilize Azure Logic Apps to consolidate security events into a single workspace. This method allows for the aggregation and integration of disparate security data into one unified workspace, thereby simplifying the analysis process. By centralizing the data, security analysts can conduct comprehensive analyses, create cohesive reports, and apply security operations more effectively.

Using Azure Logic Apps provides automation capabilities that enable the extraction, transformation, and loading (ETL) of data from various workspaces into a consolidated workspace. This is particularly beneficial for organizations operating across multiple regions or divisions where security logs may be siloed in different workspaces.

In contrast, relying on cross-workspace querying would typically not offer the same level of integration and could complicate the analysis process, as queries would need to be run separately in each context. Prioritizing the most critical workspaces may only address part of the security landscape, leaving out vital information from less critical workspaces. Implementing separate instances of Azure Sentinel in each subscription does not facilitate a cohesive view of the overall security posture but rather creates additional management overhead and complicates event correlation across subscriptions.