The diskspace plugin is activated, as to see in netdata.conf:
# remove charts of unmounted disks = yes
# update every = 1
# check for new mount points every = 15
# exclude space metrics on paths = /proc/* /sys/* /var/run/user/* /run/user/* /snap/* /var/lib/docker/*
# exclude space metrics on filesystems = *gvfs gluster *s3fs *ipfs *davfs2 *httpfs *sshfs *gdfs *moosefs fusectl autofs
# space usage for all disks = auto
# inodes usage for all disks = auto
# space usage = auto
# inodes usage = auto
However if I add a metrics as netdata.plugin_diskspace then it appears with a unit of GiB in the header about the block of the charts, but no chart appears for disk space.
All other charts as system.cpu, mem.available, disk.sdb, disk.sda, etc. appear correctly.