It looks like the cloud-based load testing service [Blitz.io](https://www.blitz.io/) is shutting down. Haven't seen anything public about this yet but Heroku just sent around an email from the Add-ons Team. The message is as follows:

Heroku Developer,

We have identified you as either the owner or collaborator of the following app(s) that has the Blitz add-on installed:

[APP NAMES]

The Blitz team has chosen to discontinue the Blitz product altogether, including the Heroku add-on. It will be removed from all apps in 60 days. We advise you to remove it yourself before that either via the Dashboard or via the CLI.

Please consider using Blazemeter or another add-on in Elements for your app's performance testing needs. Contact our support team if you run into any problems.

Thank you, The Heroku Add-ons Team