This rule detects modifications or deletions to an AWS Elastic File System (EFS) Fileshare Mount. Such actions can disrupt associated instances or applications by impacting their file systems. The detection is based on CloudTrail logs that identify when the 'DeleteMountTarget' event occurs from the 'elasticfilesystem.amazonaws.com' service, indicating that a mount target for the EFS is being removed. High-priority situations may arise when mounts are unexpectedly altered or removed, prompting the need for immediate attention to prevent potential disruptions to service operations. Since the rule specifically tracks deletion events, it can help in identifying malicious activities or unintended mistakes in the configuration of EFS mounts, maintaining the integrity and accessibility of the attached file systems.