RFR: 8351142: Add JFR monitor deflation and statistics events [v2]

[Aleksey Shipilev]

On Wed, 5 Mar 2025 20:04:13 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8351142-jfr-deflate-event
>>  - Test updates
>>  - Rework statistics event to be actually statistics
>>  - Filter JFR HiddenWait consistently
>>  - Event metadata touchups
>>  - Separate statistics event as well
>>  - Fix
>
> Looks good.

Fixed the merge conflicts, and touched up event descriptions a bit. @egahlin, see if those still make sense to you?

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PR Comment: https://git.openjdk.org/jdk/pull/23900#issuecomment-2703834508