RFR+RFA [11u]: 8213966: The ZGC JFR events should be marked as experimental

[Langer, Christoph]

Hi,

next one ��

May I please get reviews for the downport of 8213966 to jdk11u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8213966
Original Change: http://hg.openjdk.java.net/jdk/jdk/rev/e0ce50c5e220
Backport Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8213966.jdk11u/

The patch did not apply cleanly. It contained changes to a testcase that doesn’t exist in jdk11u:
test/jdk/jdk/jfr/event/metadata/TestLookForUntestedEvents.java

Now it boils down to a metadata change only (which applies cleanly).

I’ll run the full test suite before pushing.

Best regards
Christoph