There's a large number of DUTs that (according to their hostname) are
located in Stierlin Ct, but that have no assigned pool:
    $ atest host list | grep board: | grep -v pool: | grep '^chromeos[246]-' | wc -l
    195

Some of the names relate to DUTs not yet fully deployed:
    atest host list chromeos6-row2-rack12-host9
    Host                         Status  Shard  Locked  Lock Reason                        Locked by  Platform  Labels
    chromeos6-row2-rack12-host9  Ready   None   True    Repairing or deploying a new host  rbaddo               board:kefka

However, ongoing deployments don't account for all of the problems:
    $ atest host list | grep board: | grep -v pool: | grep '^chromeos[246]-' | grep -v deploying | wc -l
    142


Below is the number of problem children organized by board:
$ atest host list | grep board: | grep -v pool: | grep '^chromeos[246]-' | grep -v deploying | count_labels -b | sort -nr
     20 winky
     13 banon
     10 stout
      8 sumo
      7 edgar
      7 candy
      6 veyron_jaq
      5 sentry
      5 gnawty
      5 glimmer
      4 veyron_tiger
      4 veyron_mighty
      4 parrot
      4 link
      3 wolf
      3 swanky
      3 pyro
      3 heli
      3 cyan
      2 terra
      2 reks
      2 panther
      2 lulu
      2 gandof
      2 caroline
      1 setzer
      1 samus
      1 relm
      1 nyan_blaze
      1 lumpy
      1 kefka
      1 falco
      1 daisy
      1 clapper
      1 cave
      1 butterfly
      1 auron_paine
      1 asuka