On System Dashboard UI, alerts would be seen based on incorrect count which exceeds the supported maximum. This incorrect cumulative count is due to the older stale feature config entries which have not been deleted.
This is happening due to multiple entries for routing feature in edge_service_config table. Other stale FeatureConfigs can also be present. Normally the FeatureConfigs are deleted on successful publish on Edge appliance, or any failure.
If you encounter this error during a NSX V to T migration, please contact Broadcom Technical Support for assistance.
See Creating and managing Broadcom support cases for details on opening a case.