The Azure Event Hub Deleted detection rule identifies when an Azure Event Hub instance is deleted, which is critical for maintaining data integrity and security monitoring. Event Hubs play a vital role in collecting and processing data streams for security information and event management (SIEM) systems and real-time analytics. The rule triggers when the deletion of an Event Hub is logged, potentially indicating adversarial actions aimed at evading detection by disrupting essential data flows and removing traces of malicious activities. The rule has a high severity level as the deletion of Event Hubs can blind security teams to ongoing attacks, especially if these hubs are used for security logging. The rule supports effective incident response by querying the Azure Monitor Activity logs for any related logging infrastructure operations, helping to track whether deletions are part of a broader attack pattern or normal operational activities.