Noticed this while investigating node_exporter failures in eqiad (reported upstream as https://github.com/prometheus/node_exporter/issues/377)
It looks like /proc/mounts on labstore1001 contains multiple entries for the same filesystem+mountpoint. AFAICT it is harmless but it might keep accumulating
labstore1001:~$ sort /proc/mounts | uniq -dc
4 /dev/mapper/labstore-backup--others /exp/backup-others ext4 rw,relatime,stripe=768,data=ordered 0 0
4 /dev/mapper/labstore-backup--others /srv/backup-others ext4 rw,relatime,stripe=768,data=ordered 0 0
4 /dev/md0 /exp/backup-maps ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
4 /dev/md0 /exp/backup-others ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
4 /dev/md0 /exp/backup-scratch ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
4 /dev/md0 /exp/backup-tools ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
4 /dev/md0 /exp/project/tools-maint ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
3 /dev/md0 /srv/backup-maps ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
3 /dev/md0 /srv/backup-others ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
3 /dev/md0 /srv/backup-scratch ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
3 /dev/md0 /srv/backup-tools ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
3 /dev/md0 /srv/project/tools-maint ext4 rw,relatime,errors=remount-ro,data=ordered 0 0