RFR: 8275338: Add JFR events for notable serialization situations [v5]

[Erik Gahlin]

On Tue, 19 Dec 2023 17:53:49 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Changes according to reviewer's comments.
>
>> You mean, in the @description annotation?
> 
> Yes.

> @egahlin Are you OK with the last commit from the perspective of hotspot-jfr?

The JFR product code looks fine. 

I think the test could be simplified. There is no need to disable threshold or stack trace.

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PR Comment: https://git.openjdk.org/jdk/pull/17129#issuecomment-1892171443