I would like to monitor my btrfs-filesystem for missing drives. On
Debian mdadm uses a script in /etc/cron.daily, which calls mdadm and
sends an email if anything is wrong with the array. I would like to do
the same with btrfs. In my first attempt I grepped and cut the
information from "btrfs fi show" and let the script send an email if
the number of devices was not equal to the preselected number.

Then I saw this:

ubuntu@ubuntu:~$ sudo btrfs filesystem show
Label: none  uuid: 67b4821f-16e0-436d-b521-e4ab2c7d3ab7
    Total devices 6 FS bytes used 5.47TiB
    devid    1 size 1.81TiB used 1.71TiB path /dev/sda3
    devid    2 size 1.81TiB used 1.71TiB path /dev/sdb3
    devid    3 size 1.82TiB used 1.72TiB path /dev/sdc1
    devid    4 size 1.82TiB used 1.72TiB path /dev/sdd1
    devid    5 size 2.73TiB used 2.62TiB path /dev/sde1
    *** Some devices missing

on this page: 
The number of devices is still at 6, despite the fact that one of the
drives is missing, which means that my first idea doesnt work. I have
two questions:
1) Has anybody already written a script like this? After all, there is
no need to reinvent the wheel a second time.
2) What should I best grep for? In this case I would just go for the
"missing". Does this cover all possible outputs of btrfs fi show in
case of a damaged array? What other outputs do I need to consider for
my script.

Yours sincerely
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