The Azure Event Hub Deletion detection rule monitors for deletion events of Azure Event Hubs, which are pivotal in handling large-scale event processing. The rule is designed to identify deletion attempts that may correlate with adversarial actions aimed at evading detection during an attack. It looks for successful deletions in Azure activity logs linked to Event Hubs, indicated by the operation name 'MICROSOFT.EVENTHUB/NAMESPACES/EVENTHUBS/DELETE'. Given the critical nature of Event Hubs, deletions by unauthorized users can significantly disrupt service and indicate potential security incidents. The rule also offers potential false positive mitigations, as legitimate deletions might happen due to routine maintenance or through automation, suggesting a nuanced approach to analyzing alert triggers. Best practices for investigation and remediation include thorough auditing of Azure logs and the implementation of restrictive access controls wherever necessary.