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The R15 memory limit has been lowered to 200%

Change effective on 04 April 2016

In order to improve our platform health and stability, the R15 - Memory quota vastly exceeded error has been lowered. Originally, this limit was triggered at 500% over the limit and it will now trigger at 200% over the dyno memory limit. For more information on this error, please review this Dev Center article.

In addition to this, the transitional error R151 has been removed.

Heroku’s Legacy Platform API (v2) will be sunset on April 15, 2017 Private Space apps now feature rolling deploys for zero-downtime deployments