There's constant crashing on the log, including references to the Unraid driver, there's another user that recently had similar issues with the same HP Microserver Gen8, including some data loss due to fs corruption with both btrfs and xfs devices:
For now I would recommend going back to v6.9.2, looks like these serves don't get along with the newer Kernel, unclear for now if all Microserver gen8 will have the same issues or just a specific CPU/BIOS combo.