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

[Raffaello Giulietti]

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?

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PR Comment: https://git.openjdk.org/jdk/pull/17129#issuecomment-1891803118