8365815: JFR: Update metadata.xml with 'jfr query' examples

[egahlin]

Could I have a review of a PR that adds a couple of 'jfr query' examples to metadata.xml?

It turns out that the EventDuration event doesn't work because it has no fields. The fix is to remove the class-specific commit() method and constructor for events without fields.

Testing: test/jdk/jdk/jfr + tier1

Thanks
Erik

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• JDK-8365815: JFR: Update metadata.xml with 'jfr query' examples (Enhancement - P4)

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