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DATABASE_URL config var now unset automatically when deprovisioning Postgres add-on

Change effective on 01 April 2014

When a Postgres add-on is deprovisioned on an app, if a matching DATABASE_URL config var is set, DATABASE_URL will be unset automatically along with the standard removal of the HEROKU_POSTGRESQL_COLOR_URL config.

Build log output now available in the Dashboard app activity feed PX dynos now have an R15 threshold of 200%