Integrated: 8351187: Add JFR monitor notification event

[Aleksey Shipilev]

On Tue, 4 Mar 2025 16:05:36 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> We have `JavaMonitorWait` event, but no symmetric `JavaMonitorNotify` event. Notifications are important/interesting to track as well, for example to correlate the delay between notification and eventual wake up.
> 
> Providing this event would also replace one of of the RT counters that are going away in [JDK-8348829](https://bugs.openjdk.org/browse/JDK-8348829).
> 
> This counter is disabled by default to keep any potential impact low. We can consider flipping it to enabled by default later.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `jdk_jfr`

This pull request has now been integrated.

Changeset: 20f1bca0
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/20f1bca0770b6b4d935b068e7f6a742cef4f5449
Stats:     168 lines in 7 files changed: 162 ins; 0 del; 6 mod

8351187: Add JFR monitor notification event

Reviewed-by: dholmes, lmesnik, mgronlun

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PR: https://git.openjdk.org/jdk/pull/23901