Sorry for the delay: work has been busy.
In answer to your question:
openjdk version "1.8.0_282"
OpenJDK Runtime Environment (build 1.8.0_282-b08)
OpenJDK 64-Bit Server VM (build 25.282-b08, mixed mode)
My existing server is a mojang 1.16.4. The new servers were mojang 1.12. and 1.12.2, forge 1.17.10, and TerraFirmaPunk-2.1.0.
Running on UNRaid 6.9.1 hosted on an older Dell server with dual Xeon X5570 CPUs, 240 GiB of RAM, and plenty of free disk space. Filesystem is xfs.
No pinned CPUs.
Fifteen other Docker containers running with no issues..