kepler_node_info reports UNKNOWN cpu_architecture on RHEL9/arm64

[jharriga]

What happened?

On RHEL9/arm64 system 'kepler_node_info' incorrectly reports “cpu_architecture”

kepler_node_info{components_power_source="ampere-xgene-hwmon",cpu_architecture="unknown",platform_power_source="none",source="os"} 1

What did you expect to happen?

cpu_architecture indicates the systems cpu arch

lscpu | grep Model

Model name: Neoverse-N1
BIOS Model name: Ampere(R) Altra(R) Max Processor

How can we reproduce it (as minimally and precisely as possible)?

Download & install rpm
start service
root# systemctl start container-kepler --now
root# curl localhost:8888/metrics | grep kepler_node_info

Anything else we need to know?

No response

Kepler image tag

v0.7.9

Kubernetes version

NONE

Cloud provider or bare metal

bare metal

OS version

On Linux:

$ cat /etc/os-release
Red Hat Enterprise Linux 9.3 (Plow)

$ uname -a
Linux perf-arm-11.perf.eng.bos2.dc.redhat.com 5.14.0-362.21.1.el9_3.aarch64 #1 SMP PREEMPT_DYNAMIC Thu Jan 25 08:27:11 EST 2024 aarch64 aarch64 aarch64 GNU/Linux

Install tools

# rpm --version RPM version 4.16.1.3

Kepler deployment config

For standalone:
root# systemctl start container-kepler --now
root# curl localhost:8888/metrics | grep kepler_node_info

Container runtime (CRI) and version (if applicable)

Related plugins (CNI, CSI, ...) and versions (if applicable)

[rootfs]

current cpu architectures are from cpu_id, only working for x86. We need a sysfs id to get for ARM.