Events declared in jdk.test.lib.jfr.EventNames differ from events returned by FlightRecorder.getEventTypes()

Set eventsFromEventNamesClass has more elements than set jfrEventTypes:
ZRelocationSetGroup
ZAllocationStall
ZPageAllocation
ZUncommit
ZPageCacheFlush
ZRelocationSet

This could be because:
1) You forgot to write a unit test. Please do so in test/jdk/jdk/jfr/event/
2) You wrote a unit test, but you didn't reference the event in
   test/lib/jdk/test/lib/jfr/EventNames.java.
3) It is not feasible to test the event, not even a sanity test.
   Add the event name to test/lib/jdk/test/lib/jfr/EventNames.java
   and a short comment why it can't be tested
4) The event is experimental. Please add 'experimental="true"' to <Event>
   element in metadata.xml if it is a native event, or @Experimental if it is a
   Java event. The event will now not show up in JMC
==========================
STDERR:
java.lang.RuntimeException: Events declared in jdk.test.lib.jfr.EventNames differ from events returned by FlightRecorder.getEventTypes()
at jdk.jfr.event.metadata.TestLookForUntestedEvents.checkEventNamesClass(TestLookForUntestedEvents.java:169)
at jdk.jfr.event.metadata.TestLookForUntestedEvents.main(TestLookForUntestedEvents.java:95)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)