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Default JDK updates

Change effective on 16 May 2018

Heroku’s support for Java, Scala, Clojure, Groovy and JRuby now uses OpenJDK 8u171 as the default JDK version and OpenJDK 10.0.1 as the default JDK 10 version. Please visit the Dev Center for more information on Java version support.

Application Metrics: Toggle Request Throughput Resolution between RPS and RPM Changes to Container Registry deployment behavior on 5/29