What action should you take to ensure effective analysis of security events across all project subscriptions utilizing Azure Sentinel?

The most effective action to ensure thorough analysis of security events across all project subscriptions utilizing Azure Sentinel is to configure cross-workspace querying in Azure Sentinel settings. This approach allows you to consolidate and analyze security data from multiple workspaces or subscriptions seamlessly within a single Azure Sentinel interface.

By enabling cross-workspace querying, you can access and analyze data from different Azure Sentinel workspaces located in various subscriptions without the need to replicate data or create separate instances. This significantly enhances your ability to monitor security events, detect threats, and generate insights that reflect the security posture across all your project subscriptions.

Enabling this feature fosters collaboration among different teams and enables a unified view of security across multiple projects, which is crucial for an effective security operations framework.

Implementing a separate instance of Azure Sentinel in each subscription would lead to fragmented data management and more overhead in monitoring and coordinating responses across multiple instances.

Focusing only on the 20 most critical logs or metrics and adding them as data connectors limits the analysis perspective and may overlook other significant events that could provide critical insights into the security landscape.

Using Azure Resource Graph queries can help in aggregating and querying resources, but it's not specifically tailored to unify security event analysis from multiple subscriptions the way cross-workspace querying is designed to.