RFR: 8366232: JFR startup messages are shown with -Xlog:jfr+startup=warning

[David Holmes]

On Wed, 27 Aug 2025 12:07:54 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

> Only print the JFR startup messages when no or a < warning log level is set explicitly by the user.

I can't say I like the general changes to UL to accommodate this. I also don't really like what JFR is already doing. I'm trying to see what the motivation is here. It appears to be "give a verbose startup message but don't label it as a 'warning'".  But there is also no guarantee that `jfr+startup` is being logged to `stdout` so this could by-pass the user's control over logging output!

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PR Review: https://git.openjdk.org/jdk/pull/26957#pullrequestreview-3163457152