RFR: 8351187: Add JFR monitor notification event [v4]

[Aleksey Shipilev]

On Mon, 17 Mar 2025 10:31:56 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> That said, events that can help support and performance engineers to troubleshoot faster and reduce time to issue resolution has high value in and of itself, even if it means turning on something extra.

Yes. I think we are passing this bar with new event. We don't have to enable it by default, unless we feel strongly about it. I suppose if we find it very useful in the field, we can later argue to turn it on by default and do some performance measurements for its impact.

I take it you are fine with this PR then, @mgronlun?

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PR Comment: https://git.openjdk.org/jdk/pull/23901#issuecomment-2729573953