JVM engineers like to leverage JFR, but not commit to a fully supported event, which includes creating proper metadata, unit tests and update jfc-files.

To mitigate this problem, JFR supports experimental events. For Java events, you can use the @Experimental annotation and native events can use the experimental="true" attribute in metadata.xml. Events that are experimental are not visualized in JMC unless you tick a checkbox in the preference dialog.

To lower the bar further, we could add internal events that will not be visible in the build we ship.