Here is the details on a bare metal ubuntu 18.04 LTS server running an IO 
benchmark:
# uname -a
Linux xxx 4.15.0-39-generic #42-Ubuntu SMP Tue Oct 23 15:48:01 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux

# lsb_release -rd
Description:    Ubuntu 18.04.1 LTS
Release:        18.04

# cat /proc/diskstats 
   7       0 loop0 0 0 0 0 0 0 0 0 0 0 0
   7       1 loop1 0 0 0 0 0 0 0 0 0 0 0
   7       2 loop2 0 0 0 0 0 0 0 0 0 0 0
   7       3 loop3 0 0 0 0 0 0 0 0 0 0 0
   7       4 loop4 0 0 0 0 0 0 0 0 0 0 0
   7       5 loop5 0 0 0 0 0 0 0 0 0 0 0
   7       6 loop6 0 0 0 0 0 0 0 0 0 0 0
   7       7 loop7 0 0 0 0 0 0 0 0 0 0 0
   8       0 sda 42531 5065 2097514 177892 7213856 2831260 295763362 4616524 0 
1535632 4790132
   8       1 sda1 221 30 11808 632 2 0 2 0 0 436 632
   8       2 sda2 42146 5033 2077442 176336 7213854 2831260 295763360 4616524 0 
1535412 4788584
   8      16 sdb 77529 0 39360314 52284 613197 114047 198167776 23144 0 29212 
74964
   8      17 sdb1 77078 0 39335602 52052 613197 114047 198167776 23144 0 29100 
74732
 259       0 nvme0n1 28201525398 0 488820005576 207589544 862135419 98 
226957567536 127289372 0 389795644 709789780
 259      11 nvme0n1p1 2417230384 0 71713692888 554246764 155623487 0 
39839572992 14866796 7 116086276 414538992
 259      12 nvme0n1p2 2417484200 0 71743882112 553922380 155595754 0 
39832473344 14030424 8 115793704 412547176
 259      13 nvme0n1p3 2415958954 0 71634470992 554243464 155462257 0 
39798298112 14474168 10 115988052 413090312
 259      14 nvme0n1p4 2416615620 0 71693490456 554028440 155535038 0 
39816930048 13413172 5 115578348 412099184
 259       5 nvme1n1 9665715778 0 286976448416 2212243248 622132262 98 
165516759344 56229716 0 296178992 2019232932
 259      20 nvme1n1p1 2415904567 0 71636878008 552917888 155454273 0 
39796254208 14455924 5 116082548 412220948
 259      21 nvme1n1p2 2415512074 0 71650757824 552297300 155569570 0 
39825770240 13910420 5 115679536 412130316
 259      22 nvme1n1p3 2416548713 0 71678672568 553555664 155500210 0 
39808014080 14275504 3 116157680 412450228
 259      23 nvme1n1p4 2416416216 0 71684681400 553144864 155607183 0 
39835399168 13506844 9 115654900 412532936
 253       0 dm-0 46520 0 2049706 243712 9679815 0 295763360 4748384 0 1543256 
4994124
 259      10 nvme2n1 9667389541 0 287031008544 2207928032 622164931 98 
165525122608 56921664 0 295218964 2002099520
 259       6 nvme2n1p1 2417118800 0 71696213648 552051652 155532183 0 
39816199168 14594732 12 115840944 412346808
 259       7 nvme2n1p2 2416691746 0 71684078312 551562408 155534110 0 
39816692480 14208680 7 115539968 410287704
 259       8 nvme2n1p3 2416582480 0 71718109272 552480036 155634065 0 
39842280960 14504168 5 115924508 411293804
 259       9 nvme2n1p4 2415651523 0 71604404864 551508236 155463547 0 
39798628352 13532972 7 115275812 409783788
 259      15 nvme3n1 9667640590 0 287047711752 2205542280 622265688 98 
165550916400 56371312 0 295252232 2008945404
 259       1 nvme3n1p1 2417190392 0 71723552872 551558532 155625698 0 
39840139008 14546232 1 115786248 410727612
 259       2 nvme3n1p2 2415650590 0 71604369040 550597652 155449331 0 
39794989056 13932652 1 115166100 409314844
 259       3 nvme3n1p3 2417003647 0 71696320488 551775976 155590921 0 
39831236096 14276596 5 115725292 410703296
 259       4 nvme3n1p4 2416453707 0 71695930384 551283044 155598712 0 
39833230592 13534668 7 115246604 409574764
 253       1 dm-1 587 0 26368 828 0 0 0 0 0 656 828

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https://bugs.launchpad.net/bugs/1807432

Title:
  /proc/diskstats does not rollup queue depth from partitions

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