After upgrading to ICM 10, login messages are added to the backend tenant log instead of the audit log. The tenant logs are accessed from a link which is underneath the Model Options in the models drop-down. ('View Tenant Log' option)
The request is to clearly define what models a user is toggling into and out of. The tenant logs just mention the admin/web user logged in but does not mention the model the admin/web user logged in to.