Create a cluster with 2 instances and start the cluster. From the Configurations Page,In the Configurations Table, click on the clustered instance link in the "Instances" column, The below error is shown in the console:
Error An error has occurred
REST Request 'https://localhost:4848/management/domain/clusters/cluster//get-health' failed with response code '404'.
This is a regression from b10. This error is seen only for clustered instance and not for standalone instances.