If there is workspace created with CodeReady before upgrade of CodeReady 2, in the CodeReady console there is warning saying that user needs to follow documentation to update the workspace. The link won't take the user to that documentation:

https://access.redhat.com/documentation/en-us/red_hat_codeready_workspaces/2.0//che-7/converting-a-che-6-workspace-to-a-che-7-devfile/