RFR: 8351187: Add JFR monitor notification event [v3]

[David Holmes]

On Wed, 5 Mar 2025 12:26:40 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> On the other hand, the way the event is currently implemented, it only fires when wait-set is not empty,

So it it only wants to record notifications that actually did something, then shouldn't we be checking tally before posting the event?

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PR Comment: https://git.openjdk.org/jdk/pull/23901#issuecomment-2702525194