What is an effective way to aggregate security event data from multiple Log Analytics workspaces?

The most effective way to aggregate security event data from multiple Log Analytics workspaces is to use Azure Resource Graph queries. This tool allows you to quickly query and retrieve resource information across your Azure subscriptions and management groups, making it ideal for situations where data is fragmented across different workspaces. Azure Resource Graph can efficiently summarize and provide insights across multiple resources, which is crucial for a comprehensive security view.

Using Azure Resource Graph, one can perform complex queries to cross-reference the data within different workspaces, enabling a centralized approach to monitoring and threat detection. This is especially important in scenarios where businesses manage several Log Analytics workspaces for compliance, geographic, or departmental reasons and need to correlate security events for broader visibility.

Other approaches, while beneficial in different contexts, do not provide the same level of aggregation capability across different workspaces. For example, deploying separate instances of Azure Sentinel for each workspace means each instance would operate independently, leading to siloed data rather than an aggregated view. Implementing Azure Monitor is more about tracking resource performance metrics rather than aggregating Log Analytics data. Integrating with Azure Logic Apps can facilitate automated workflows but does not inherently provide aggregation of security event data from the workspaces themselves.