RFR: 8348829: Remove ObjectMonitor perf counters [v2]

[Aleksey Shipilev]

On Mon, 3 Mar 2025 16:45:18 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> See bug for more discussion. I believe these counters are useless and come with more trouble than their worth.
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - Merge branch 'master' into JDK-8348829-remove-om-counters
>  - Counters removal

Thanks! I looked deeper what JFR events are available to capture what where these counters help, and I think we want a few new ones (see linked issues). Adding these new JFR events would require code changes in the vicinity of this PR, so I would have to re-merge anyway. Until those events land, this PR is on hold.

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PR Comment: https://git.openjdk.org/jdk/pull/23326#issuecomment-2698089732