You’ve analyzed traffic patterns for your organization’s main application, which is served through an external global HTTP(S) Load Balancer. The review indicates that backend servers are becoming overloaded due to sudden surges in client request rates. To mitigate this, you want to enforce a limit on concurrent sessions and ensure that clients exceeding this limit receive an HTTP 429 (Too Many Requests) response. You want to implement a solution that follows Google Cloud's recommended practices. What should you do?