Incorrect value for filesystem_{avail,size}_bytes records for LVM partition #2285
Description
Host operating system: output of uname -a
Linux secure-media 5.13.0-28-generic #31-Ubuntu SMP Thu Jan 13 17:41:06 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
node_exporter version: output of node_exporter --version
This is from a snap package installed via snap install --edge node-exporter (--beta is broken and doesn't let me configure). Based on looking at the source code though, that doesn't seem like it would matter at all.
node_exporter, version (branch: , revision: )
build user:
build date:
go version: go1.17.6
platform: linux/amd64
node_exporter command line flags
--collector.filesystem.mount-points-exclude=^/(dev|proc|boot|run|run/.+|sys|sys/.+|var/lib/docker/.+)($) --no-collector.mdadm --no-collector.timex --no-collector.softnet --no-collector.schedstat --no-collector.pressure --no-collector.entropy
Are you running node_exporter in Docker?
No
What did you do that produced an error?
No error
What did you expect to see?
From df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 1.5G 2.6M 1.5G 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 456G 21G 413G 5% /
tmpfs 7.5G 0 7.5G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/nvme0n1p2 974M 85M 822M 10% /boot
/dev/nvme0n1p1 511M 5.3M 506M 2% /boot/efi
tmpfs 1.5G 44K 1.5G 1% /run/user/121
/dev/sda1 7.3T 7.0T 290G 97% /media/terra
tmpfs 1.5G 32K 1.5G 1% /run/user/1000
What did you see instead?
from /metrics
# HELP node_filesystem_avail_bytes Filesystem space available to non-root users in bytes.
# TYPE node_filesystem_avail_bytes gauge
node_filesystem_avail_bytes{device="/dev/mapper/ubuntu--vg-ubuntu--lv",fstype="ext4",mountpoint="/"} 0
node_filesystem_avail_bytes{device="/dev/nvme0n1p1",fstype="vfat",mountpoint="/boot/efi"} 0
node_filesystem_avail_bytes{device="/dev/sda1",fstype="exfat",mountpoint="/media/terra"} 3.11334797312e+11
node_filesystem_avail_bytes{device="tmpfs",fstype="tmpfs",mountpoint="/dev/shm"} 8.039559168e+09
# HELP node_filesystem_files_free Filesystem total free file nodes.
# TYPE node_filesystem_files_free gauge
node_filesystem_files_free{device="/dev/mapper/ubuntu--vg-ubuntu--lv",fstype="ext4",mountpoint="/"} 0
node_filesystem_files_free{device="/dev/nvme0n1p1",fstype="vfat",mountpoint="/boot/efi"} 0
node_filesystem_files_free{device="/dev/sda1",fstype="exfat",mountpoint="/media/terra"} 0
node_filesystem_files_free{device="tmpfs",fstype="tmpfs",mountpoint="/dev/shm"} 1.962782e+06
Looking at the code, it appears it parses from /proc/1/mounts. When I cat /proc/1/mounts:
From /proc/1/mounts
$ cat /proc/1/mounts
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=7815372k,nr_inodes=1953843,mode=755,inode64 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,nodev,noexec,relatime,size=1570228k,mode=755,inode64 0 0
/dev/mapper/ubuntu--vg-ubuntu--lv / ext4 rw,relatime 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev,inode64 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k,inode64 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
efivarfs /sys/firmware/efi/efivars efivarfs rw,nosuid,nodev,noexec,relatime 0 0
none /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=22115 0 0
mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime,pagesize=2M 0 0
tracefs /sys/kernel/tracing tracefs rw,nosuid,nodev,noexec,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
systemd-1 /media/terra autofs rw,relatime,fd=58,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=28874 0 0
/dev/loop0 /snap/core18/2284 squashfs ro,nodev,relatime 0 0
/dev/loop1 /snap/core20/1169 squashfs ro,nodev,relatime 0 0
/dev/nvme0n1p2 /boot ext4 rw,relatime 0 0
/dev/nvme0n1p1 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
/dev/loop2 /snap/docker/1458 squashfs ro,nodev,relatime 0 0
/dev/loop5 /snap/core20/1328 squashfs ro,nodev,relatime 0 0
/dev/loop6 /snap/snapd/13170 squashfs ro,nodev,relatime 0 0
/dev/loop7 /snap/lxd/22340 squashfs ro,nodev,relatime 0 0
/dev/loop8 /snap/snapd/14549 squashfs ro,nodev,relatime 0 0
tmpfs /run/user/121 tmpfs rw,nosuid,nodev,relatime,size=1570224k,nr_inodes=392556,mode=700,uid=121,gid=129,inode64 0 0
tmpfs /run/snapd/ns tmpfs rw,nosuid,nodev,noexec,relatime,size=1570228k,mode=755,inode64 0 0
nsfs /run/snapd/ns/docker.mnt nsfs rw 0 0
nsfs /run/snapd/ns/lxd.mnt nsfs rw 0 0
/dev/sda1 /media/terra exfat rw,noatime,uid=1000,gid=1000,fmask=0022,dmask=0022,iocharset=utf8,errors=remount-ro 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0
/dev/loop9 /snap/lxd/22358 squashfs ro,nodev,relatime 0 0
/dev/loop3 /snap/node-exporter/99 squashfs ro,nodev,relatime 0 0
nsfs /run/snapd/ns/node-exporter.mnt nsfs rw 0 0
/dev/loop4 /snap/node-exporter/687 squashfs ro,nodev,relatime 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=1570224k,nr_inodes=392556,mode=700,uid=1000,gid=1000,inode64 0 0