Alloy running in docker does not see network interface metrics from the host

[maitmandel]

What's wrong?

Alloy running in docker does not see counters for all interfaces. It does see that the interfaces exist, but most counters are empty:

Notice how _node_networkinfo also lists devices like enx0 etc but _node_network_receive_bytestotal only has metrics from eth0 and lo

Steps to reproduce

Run Alloy in docker container, mounting the devices etc from host

System information

Ubuntu 24.04 LTS

Software version

Grafana Alloy v1.4.1

Configuration

compose.yaml:

services:
  alloy :
    image: grafana/alloy:v1.4.1
    volumes:
      - ./config.alloy:/etc/alloy/config.alloy
      - /var/log:/host-var-log
      - /proc:/host-proc
      - /sys:/host-sys
      - /:/host-root
      - /run/udev/data:/host-udev
    env_file:
      - .env
    cap_add:
      - SYS_PTRACE
    privileged: true
    command: run --storage.path=/var/lib/alloy/data /etc/alloy/config.alloy

config.alloy:

...
prometheus.exporter.unix "default" {
 procfs_path = "/host-proc/"
 sysfs_path = "/host-sys/"
 rootfs_path = "/host-root/"
 udev_data_path = "/host-udev/"
}
...

Logs

No response

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