Garbage Collection Time with ZGC

AntonioSousa — Tue, 02 Jun 2026 20:28:51 GMT

ZGC is the Z Garbage Collector.

It's quite different from other Garbage Collectors, as it is always "working".

It seems that Dynatrace is misinterpreting Garbage Collection time, and always maintaining a problem open. Working with OpenJDK 17.0.18 and OneAgent 1.335.

There are very few links to ZGC in Dynatrace (this and this), so wondering if someone has seen this in the wild?

Re: Garbage Collection Time with ZGC

sujit_k_singh — Tue, 02 Jun 2026 23:10:03 GMT

Hi @AntonioSousa

This was a known issue fixed in OneAgent 1.305 (OA-39185) — "Java heap and GC metrics are now reported reliably when the application uses ZGC." OneAgent release notes version 1.305 — Dynatrace Docs

Since you're on 1.335, the metrics should already be accurate. If the problem is still being raised, it may have baselined GC suspension time using patterns that don't suit ZGC's concurrent nature. This is just my assumption as i have never encountered this issue 😀

or else support is the last option.

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Garbage Collection Time with ZGC

Re: Garbage Collection Time with ZGC