RFR: 8266936: Add a finalization JFR event

[Brent Christian]

On Thu, 8 Jul 2021 19:47:26 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Greetings,
> 
> Object.finalize() was deprecated in JDK9. There is an ongoing effort to replace and mitigate Object.finalize() uses in the JDK libraries; please see https://bugs.openjdk.java.net/browse/JDK-8253568 for more information. 
> 
> We would also like to assist users in replacing and mitigating uses in non-JDK code.
> 
> Hence, this changeset adds a periodic JFR event to help identify which classes are overriding Object.finalize().
> 
> Thanks
> Markus

src/hotspot/share/jfr/metadata/metadata.xml line 1084:

> 1082:   </Event>
> 1083: 
> 1084:   <Event name="Finalizer" category="Java Application" label="Finalizer" thread="false" startTime="false" period="endChunk">

Would it make sense for this event to be under the "Java Virtual Machine, GC" category?

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PR: https://git.openjdk.java.net/jdk/pull/4731