RFR: 8269470: Add truncation and compression information to EventHeapDump [v2]

[Denghui Dong]

On Mon, 28 Jun 2021 07:39:40 GMT, Denghui Dong <ddong at openjdk.org> wrote:

>> Could I have a review of this change that adds the truncation and compression information to EventHeapDump?
>> 
>> We occasionally receive feedback from users that the heap size parsed from the heap dump does not match the GC log. We think this may be caused by the truncation of the heap dump.
>> 
>> It would be nice to add truncation info to the EventHeapDump.
>> 
>> Also, this patch adds the compression info which is trivial to add.
>> 
>> Regards,
>> Denghui
>
> Denghui Dong has updated the pull request incrementally with one additional commit since the last revision:
> 
>   wrong return type

Forward to serviceability

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PR: https://git.openjdk.java.net/jdk/pull/4608