node_exporter not able to discover expected filesystem devices

[Sohaib Omar]

Hi all, node_exporter is not able to return filesystem_bytes except devices that are mounted on "/" below are the filesystem devices on my azure instance.

Filesystem             Type     1K-blocks    Used Available Use% Mounted on

udev                   devtmpfs   8167128       0   8167128   0% /dev

tmpfs                  tmpfs      1637096    3204   1633892   1% /run

/dev/sdb1              ext4      30309264 7512552  22780328  25% /

tmpfs                  tmpfs      8185464      12   8185452   1% /dev/shm

tmpfs                  tmpfs         5120       0      5120   0% /run/lock

tmpfs                  tmpfs      8185464       0   8185464   0% /sys/fs/cgroup

/dev/mapper/logs-vol   ext4      10253588   85088   9627932   1% /var/log

/dev/mapper/docker-vol ext4      30830500 3699564  25541792  13% /var/lib/docker

/dev/sdb15             vfat        106858    3668    103190   4% /boot/efi

/dev/sdc1              ext4      32895696   49180  31152468   1% /mnt

tmpfs                  tmpfs      1637092       0   1637092   0% /run/user/1000

I am running node_exporter as a daemonset in Kubernetes, with the below config, I am only able to get filesystem info of only one ext4 fs-type /(dev/sdb1). Whereas I was expecting to see the filesystem stats of all ext4 fs types. 

node_exporter: v0.18.1

daemonset-spec.yaml

spec:

containers:

- args:

- --path.procfs=/host/proc

- --path.sysfs=/host/sys

- --collector.filesystem.ignored-mount-points=^/(dev|sys)($|/)

- --collector.filesystem.ignored-fs-types=^(autofs|binfmt_misc|cgroup|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|mqueue|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|sysfs|tracefs)$

image: quay.io/prometheus/node-exporter:v0.18.1

name: node-exporter

volumeMounts:

- mountPath: /host/proc

name: proc

readOnly: false

- mountPath: /host/sys

name: sys

readOnly: false

- mountPath: /host/root

mountPropagation: HostToContainer

name: root

readOnly: true

volumes:

- hostPath:

path: /proc

name: proc

- hostPath:

path: /sys

name: sys

- hostPath:

path: /

name: root

 What am I doing wrong here?

I also get the bellow error by node_exporter

time="2020-05-13T11:11:32Z" level=debug msg="Error on statfs() system call for \"/mnt\": no such file or directory" source="filesystem_linux.go:90"
time="2020-05-13T11:15:32Z" level=debug msg="Error on statfs() system call for \"/var/log\": no such file or directory" source="filesystem_linux.go:90"
time="2020-05-13T11:15:32Z" level=debug msg="Error on statfs() system call for \"/var/lib/docker\": no such file or directory" source="filesystem_linux.go:90"

Thanks