Yes, the kernel permissions for rapl changed.

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.4.77&id=19f6d91bdad42200aac557a683c17b1f65ee6c94

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8694

On Sat, Aug 14, 2021 at 2:22 PM Brian Candler <[email protected]> wrote:

> I presume you're running the latest version 1.2.2?
>
> Maybe strace will help you understand what's going on:
>
> strace -f -s128 -p <pid-of-node-exporter> 2>strace.out
>
> You can see which files it's trying to access and whether it's getting
> permission errors.
>
> FWIW, I just tried running node_exporter as root and normal users, and I
> got 3906 and 3900 lines of metrics respectively.  The only ones which were
> missing were:
>
> # HELP node_rapl_core_joules_total Current RAPL core value in joules
> # TYPE node_rapl_core_joules_total counter
> node_rapl_core_joules_total{index="0"} 79345.889568
> # HELP node_rapl_package_joules_total Current RAPL package value in joules
> # TYPE node_rapl_package_joules_total counter
> node_rapl_package_joules_total{index="0"} 129630.134976
>
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