RFR: 8372348: Adjust some UL / JFR string deduplication output messages

[Matthias Baesken]

On Wed, 10 Dec 2025 15:24:47 GMT, Andreas Steiner <asteiner at openjdk.org> wrote:

>> The avg  (now named total avg) is for some people also a bit mysterious .
>> It is , taken from total_stat , the` deduped bytes / new bytes` .  Why is it called avg? avg of what ?
>
> Adding total will be helpful already, but why are not the numbers printed on which the avg is based? Because otherwise you don't get an impression what the percentage mean.

` total avg of  deduped / new unknown bytes ` maybe ? That mentions what is used for the computation .
We could also print the values of  total deduped and new to make it more clear .

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PR Review Comment: https://git.openjdk.org/jdk/pull/28455#discussion_r2610777320