The Jenkins platform SIG stopped all efforts with the OpenJ9 virtual machine (IBM Semeru) about 2 years ago. We didn’t have active contributors that were willing to test it or maintain it.
The hotspot virtual machine is available from Eclipse Temurin for Java 11 on amd64, aarch64, s390x, and ppc64le. The hotspot virtual machine is regularly tested with Jenkins on multiple architectures.
Use the hotspot virtual machine, not the OpenJ9 virtual machine.