There are only 3 green M58 and 9 green M57 for caroline for the past month

M58
  https://cros-goldeneye.corp.google.com/chromeos/console/listBuild?boards=caroline&milestone=58&chromeOsVersion=&chromeVersion=&startTimeFrom=&startTimeTo=#/

M57 
https://cros-goldeneye.corp.google.com/chromeos/console/listBuild?boards=caroline&milestone=57&chromeOsVersion=&chromeVersion=&startTimeFrom=&startTimeTo=#%2F

example failure in M58 https://uberchromegw.corp.google.com/i/chromeos/builders/caroline-release/builds/456
and logs


@@@BUILD_STEP@PaygenTestBeta@@@
************************************************************
@@@STEP_LINK@stdout-->stdio@https://luci-logdog.appspot.com/v/?s=chromeos%2Fbb%2Fchromeos%2Fcaroline-release%2F456%2F%2B%2Frecipes%2Fsteps%2FPaygenTestBeta%2F0%2Fstdout@@@
** Start Stage PaygenTestBeta - Fri, 03 Mar 2017 07:40:59 -0800 (PST)
** 
** Stage that schedules the payload tests.
************************************************************
07:40:59: INFO: Running cidb query on pid 20093, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7fe5983c7dd0>
Preconditions for the stage successfully met. Beginning to execute stage...
07:40:59: INFO: Running cidb query on pid 20093, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7fe598276090>
07:40:59: INFO: RunCommand: /b/cbuild/internal_master/chromite/third_party/swarming.client/swarming.py run --swarming chromeos-proxy.appspot.com --task-summary-json /tmp/cbuildbot-tmpfNJ632/tmpXa5EcM/temp_summary.json --raw-cmd --task-name caroline-release/R58-9334.0.0-paygen_au_beta --dimension os Ubuntu-14.04 --dimension pool default --print-status-updates --timeout 14400 --io-timeout 14400 --hard-timeout 14400 --expiration 1200 '--tags=priority:Build' '--tags=suite:paygen_au_beta' '--tags=build:caroline-release/R58-9334.0.0' '--tags=task_name:caroline-release/R58-9334.0.0-paygen_au_beta' '--tags=board:caroline' -- /usr/local/autotest/site_utils/run_suite.py --build caroline-release/R58-9334.0.0 --board caroline --suite_name paygen_au_beta --pool bvt --file_bugs True --priority Build --timeout_mins 180 --retry True --suite_min_duts 2 -c
Autotest instance: cautotest
03-03-2017 [07:41:04] Submitted create_suite_job rpc
03-03-2017 [07:41:11] Created suite job: http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=104589734
@@@STEP_LINK@Link to suite@http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=104589734@@@
--create_and_return was specified, terminating now.
Will return from run_suite with status: OK
07:41:13: INFO: RunCommand: /b/cbuild/internal_master/chromite/third_party/swarming.client/swarming.py run --swarming chromeos-proxy.appspot.com --task-summary-json /tmp/cbuildbot-tmpfNJ632/tmpZEaMRP/temp_summary.json --raw-cmd --task-name caroline-release/R58-9334.0.0-paygen_au_beta --dimension os Ubuntu-14.04 --dimension pool default --print-status-updates --timeout 14400 --io-timeout 14400 --hard-timeout 14400 --expiration 1200 '--tags=priority:Build' '--tags=suite:paygen_au_beta' '--tags=build:caroline-release/R58-9334.0.0' '--tags=task_name:caroline-release/R58-9334.0.0-paygen_au_beta' '--tags=board:caroline' -- /usr/local/autotest/site_utils/run_suite.py --build caroline-release/R58-9334.0.0 --board caroline --suite_name paygen_au_beta --pool bvt --file_bugs True --priority Build --timeout_mins 180 --retry True --suite_min_duts 2 -m 104589734
08:02:49: INFO: Refreshing due to a 401 (attempt 1/2)
08:02:49: INFO: Refreshing access_token
09:08:14: INFO: Refreshing due to a 401 (attempt 1/2)
09:08:14: INFO: Refreshing access_token

@@@STEP_FAILURE@@@
09:50:44: ERROR: Timeout occurred- waited 27462 seconds, failing. Timeout reason: This build has reached the timeout deadline set by the master. Either this stage or a previous one took too long (see stage timing historical summary in ReportStage) or the build failed to start on time.
09:50:44: INFO: Running cidb query on pid 27201, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7fe5983b4b50>

@@@STEP_FAILURE@@@
09:50:45: ERROR: Timeout occurred- waited 27805 seconds, failing. Timeout reason: This build has reached the timeout deadline set by the master. Either this stage or a previous one took too long (see stage timing historical summary in ReportStage) or the build failed to start on time.
09:50:46: INFO: Running cidb query on pid 27201, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7fe59d3bab90>