Canary bvt-release fails due to lack of enough duts to run tests

chromeos-golo-server1-129: 3b5b5f5f97553010 3
  Autotest instance created: cautotest-prod
  TestLabException: Not enough DUTs for board: buddy, pool: bvt; required: 4, found: 3
  Traceback (most recent call last):
    File "/usr/local/autotest/site_utils/run_suite.py", line 2030, in _run_task
      return _run_suite(options)
    File "/usr/local/autotest/site_utils/run_suite.py", line 1771, in _run_suite
      options.skip_duts_check)
    File "/usr/local/autotest/site_utils/diagnosis_utils.py", line 330, in check_dut_availability
      hosts=hosts)
  NotEnoughDutsError: Not enough DUTs for board: buddy, pool: bvt; required: 4, found: 3
  Will return from run_suite with status: INFRA_FAILURE
cmd=['/b/c/cbuild/repository/chromite/third_party/swarming.client/swarming.py', 'run', '--swarming', 'chromeos-proxy.appspot.com', '--task-summary-json', '/tmp/cbuildbot-tmpZMI1XB/tmpwndoPC/temp_summary.json', '--raw-cmd', '--task-name', u'buddy-release/R66-10352.0.0-bvt-installer', '--dimension', 'os', 'Ubuntu-14.04', '--dimension', 'pool', 'default', '--print-status-updates', '--timeout', '14400', '--io-timeout', '14400', '--hard-timeout', '14400', '--expiration', '1200', u'--tags=priority:CQ', u'--tags=suite:bvt-installer', u'--tags=build:buddy-release/R66-10352.0.0', u'--tags=task_name:buddy-release/R66-10352.0.0-bvt-installer', u'--tags=board:buddy', '--', '/usr/local/autotest/site_utils/run_suite.py', '--build', u'buddy-release/R66-10352.0.0', '--board', u'buddy', '--suite_name', u'bvt-installer', '--pool', u'bvt', '--file_bugs', 'True', '--priority', 'CQ', '--timeout_mins', '180', '--retry', 'True', '--max_retries', '5', '--minimum_duts', '4', '--suite_min_duts', '6', '--offload_failures_only', 'False', '--job_keyvals', "{'cidb_build_stage_id': 69157579L, 'cidb_build_id': 2250954, 'datastore_parent_key': ('Build', 2250954, 'BuildStage', 69157579L)}", '-c']
Autotest instance created: cautotest-prod
TestLabException: Not enough DUTs for board: buddy, pool: bvt; required: 4, found: 3
Traceback (most recent call last):
  File "/usr/local/autotest/site_utils/run_suite.py", line 2030, in _run_task
    return _run_suite(options)
  File "/usr/local/autotest/site_utils/run_suite.py", line 1771, in _run_suite
    options.skip_duts_check)
  File "/usr/local/autotest/site_utils/diagnosis_utils.py", line 330, in check_dut_availability
    hosts=hosts)
NotEnoughDutsError: Not enough DUTs for board: buddy, pool: bvt; required: 4, found: 3