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Add docs for VirtualThreadMetrics #5610

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Oct 31, 2024
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Add docs for VirtualThreadMetrics #5610

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11 changes: 11 additions & 0 deletions docs/modules/ROOT/pages/reference/jvm.adoc
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Expand Up @@ -42,3 +42,14 @@ another. The reported value underestimates the actual total number of steals whe
* `executor.running` (`Gauge`): An estimate of the number of worker threads that are not blocked but are waiting to join tasks or for other managed synchronization threads.
* `executor.parallelism` (`Gauge`): The targeted parallelism level of this pool.
* `executor.pool.size` (`Gauge`): The current number of threads in the pool.

== Java 21 Metrics

Micrometer provides support for https://openjdk.org/jeps/444[virtual threads] released in Java 21. In order to utilize it, you need to add the `io.micrometer:micrometer-java21` dependency to your classpath to use the binder:

[source, java]
----
new VirtualThreadMetrics().bindTo(registry);
----

The binder measures the duration (and counts the number of events) of virtual threads being pinned; also counts the number of events when starting or unparking a virtual thread failed.