I'm primarily interested in how to do custom events on OpenJ9 (jdk.jfr.* and jdk.jfr.consumer.* equivalents). I looked through various Eclipse and IBM documentation but didn't see this functionality pop up.

Does the Trace Java API [1] provide the required functionality? It allows the application to register tracepoints and inject them into the per-thread tracebuffers. These are - by default - an in-memory ring buffer that records the last few events or can be redirected to a file.

is there another public location where one can follow along or join the conversation about OpenJ9's approach?

This is a really good question. IBM HealthCenter is owned by IBM and to my knowledge, hasn't been opened sourced. The OpenJ9 project had relied on HealthCenter for historical reasons (and because HC supported OpenJ9 and was available). I'm not sure what the current state of HC is and what kind of resources are behind it today. Maybe @mstoodle or @pshipton can comment?

This may be an area we need to re-investigate if the current path still works or if we should give JFR / Mission Control another look

JEP 328 Flight Recorder #1876

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