Greetings, in the DC/OS 1.9.1 version of Marathon, calling PUT `/v2/apps/group/appname` with an intent to restart the app fails silently when the app is already deployed. In the past, this API would successfully restart an app that was already deployed. It no longer seems to do this. 

Instead, POST `/v2/apps/group/appname/restart` must be called. See discussion at https://dcos-community.slack.com/archives/C052AG7RQ/p1500894363012384.

Apologies if the severity of this is incorrect, there is no workaround for this issue. Please adjust it according to community standards if it is set incorrectly. Thanks!