Blame SOURCES/README.md

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Package of LTS OpenJDK 8
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OpenJDK have release cadence of 6 months. but 3/4 of them are Short Term Supported for 6 months only. This package is designed to harbore them. Currently it is build on openJDK 10. LTSs (next is 11) will go as separate packages. 
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JDK8 is last LTS release of Java platform. It is bringing many cool improvements - http://openjdk.java.net/projects/jdk/8/ and is landing to your RHEL. Where it will be maintained for several years. You will always be allowed to install Used LTSs in build root, and alongside via alternatives. 
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See announcement: http://mail.openjdk.java.net/pipermail/discuss/2017-September/004281.html
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See java SIG plans: https://jvanek.fedorapeople.org/devconf/2018/changesInjavaReleaseProcess.pdf
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