# btrfs --version
btrfs-progs v6.1.3

The output of
btrfs device stats /srv/btrfs-data
and
btrfs device stats -T /srv/btrfs-data
should contain the same information but it does not.

See below:

# btrfs device stats /srv/btrfs-data
[/dev/sdc1].write_io_errs    0
[/dev/sdc1].read_io_errs     0
[/dev/sdc1].flush_io_errs    0
[/dev/sdc1].corruption_errs  0
[/dev/sdc1].generation_errs  0
[/dev/sdb1].write_io_errs    7489899
[/dev/sdb1].read_io_errs     3751023
[/dev/sdb1].flush_io_errs    117
[/dev/sdb1].corruption_errs  68
[/dev/sdb1].generation_errs  25

# btrfs device stats -T /srv/btrfs-data
Id Path      Write errors Read errors Flush errors Corruption errors Generation errors
-- --------- ------------ ----------- ------------ ----------------- -----------------
 1 /dev/sdc1            0           0            0                 0                 0
 2 /dev/sdb1           25          25           25                25                25