I found this topic CPU utilization shows 0 MHz on ARM servers · Issue #14055 · hashicorp/nomad · GitHub
As I understand, currently it is not possible to get the max CPU frequency dynamically from ARM processors.
However, most AWS ARM64 instances are mapped manually here: nomad/env_aws_cpu.go at 087ac3a0f203e607ce4f6dc6ea4ab0562771122c · hashicorp/nomad · GitHub
What I found was that when I am using AWS instance and start Nomad, it cannot read individual task CPU usage and the host CPU usage (percentage wise). Is this also expected? Some tools like node-exporter and CLI tool docker stats properly show CPU usage.