No processes found is shown within a container/problem regarding the number of file descriptors

[francoisthire]

When running the following command:

sudo docker run   --volume=/:/rootfs:ro   --volume=/var/run:/var/run:ro   --volume=/sys:/sys:ro   --volume=/var/lib/docker/:/var/lib/docker:ro   --volume=/dev/disk/:/dev/disk:ro   --publish=8080:8080   --detach=true   --name=cadvisor   --privileged   --device=/dev/kmsg   gcr.io/cadvisor/cadvisor:v0.49.1 --enable_metrics process

on a machine that has another container running, I am not able to see its processes. I tried locally, and on GCP.

It monitors all the other metrics by default, except on the container page I have the message: No processes found.

It is not the case on the page http://35.240.68.199:8080/containers/ where some processes appears after a few seconds included the ones running within the container.

Moreover, the page http://35.240.68.199:8080/metrics is not able to count the number of file descriptors running on my container, but it does count something for the cadvisor container. How is this possible?