If customers are using Metrics Forwarder and have registered metrics from Scheduler for PCF, there is no current monitoring out-of-the-box after upgrading to TAS 2.5.x (https://techdocs.broadcom.com/us/en/vmware-tanzu/platform-services/scheduler-for-tanzu/2-0/scheduler-tanzu/architecture.html)
Metrics Forwarder has reached EOL and its replacement, Metric Registrar, currently does not consume any custom metrics from the Scheduler for PCF service.