Alerts like: http://shortn/_nPOAkIZ2Rk

Alert Details
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Description:
Shard cros-full-0036.mtv has a low number of new jobs.

name: TooFewJobsMatchedToHostsAlert
current value: 0
threshold: Lt(50) for 10m
alert fields: {data_center=mtv,host_name=cros-full-0036,  
metric:role=ROLE_AFE,ROLE_HOST_SCHEDULER,ROLE_SCHEDULER}

sent at: 2018-11-08 05:52:03
active since: 2018-11-07 15:05:58 (14 hours 46 mins)

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I believe they are spurious.

There aren't that many DUTs on master (by design)
pprabhu@pprabhu:chromiumos$ atest host list | awk '{if($3 == "None"){print $0;}}' | count_labels -b | sort -n | tail                                                                                 [53/53]
      1 squawks
      1 x86-alex
      2 atlas
      2 grunt
      4 celes
      5 octopus
      5 ultima
      9 fizz-moblab
     20 fizz
     58 total

On top of that, something seems amiss. One of the fizz DUTs claims to belong to cros-full-0040.mtv: http://cautotest/afe/#tab_id=view_host&object_id=2490