This detection rule focuses on monitoring changes made to firewall rules within the Google Cloud Platform, specifically when such rules are modified, added, or deleted. It utilizes audit logs from GCP to trigger alerts based on specific API call methods associated with firewall rule management. The detection relies on identifying method names such as 'Compute.Firewalls.Delete', 'Compute.Firewalls.Patch', 'Compute.Firewalls.Update', and 'Compute.Firewalls.Insert'. When any of these actions are detected in the audit logs, the rule flags the events as potential threats, which may indicate malicious activities or unauthorized changes needing administrative scrutiny. The key advantage is to ensure the integrity and security of cloud network configurations by immediately notifying administrators of unexpected changes, enabling a quick response to potential threats or misconfigurations.