Update: This issue has been fixed. Realtime data and smart insights should be back now. View counts for the affected videos have been restored. Thanks for your reports!https://twitter.com/TeamYouTube/status/1159885087636246534 …
If you haven't heard back yet, this usually means your channel is being held for additional reviews (bc your content is close to not meeting policies). Take another look at YPP Policies & you can use this time to make updates. More here: https://yt.be/help/YPP-review