Any nightscout/heroku wizards out there?

Recently the mLab mongoDB heroku addon was shut down which I found out by an email, and my nightscout website no longer works, and I can't access my history/records. I set this all up a fair while ago, and I'm not familiar with this sort of stuff at all, anyone know what the deal is and how I should go about setting it up again?

https://docs.mlab.com/how-to-migrate-nightscout-sandbox-heroku-addons-to-atlas/ I managed to find this from what I was linked in the email