How to understand the following "btrfs fi show" output?

# btrfs fi show /var/lib/lxd
Label: 'btrfs'  uuid: f5f30428-ec5b-4497-82de-6e20065e6f61
        Total devices 2 FS bytes used 136.18GiB
        devid    1 size 423.13GiB used 423.13GiB path /dev/sda3
        devid    2 size 423.13GiB used 423.13GiB path /dev/sdb3

Why is it "size 423.13GiB used 423.13GiB"? Is it full?

I had "No space left" on this filesystem just yesterday (running kernel 4.7.4). This is btrfs RAID-1 on SSD disks. This filesystem is used for 20-30 LXD containers with different roles (mongo, mysql, postgres databases, webservers etc.), around 150 read-only snapshots, btrfs compression is disabled.

Both "btrfs fi df" and "df -h" show plenty of space:

# btrfs fi df /var/lib/lxd
Data, RAID1: total=417.12GiB, used=131.33GiB
System, RAID1: total=8.00MiB, used=80.00KiB
Metadata, RAID1: total=6.00GiB, used=4.86GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3       424G  137G  286G  33% /var/lib/lxd

Tomasz Chmielewski
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