No logs are collected for some jobs, making it impossible to do any further debugging.  For instance:

https://uberchromegw.corp.google.com/i/chromeos/builders/expresso-release/builds/1038

https://uberchromegw.corp.google.com/i/chromeos/builders/expresso-release/builds/1038/steps/AUTest%20%5Bau%5D/logs/stdio

Suite job                           [ PASSED ]
platform_Powerwash                  [ FAILED ]
platform_Powerwash                    ABORT: Timed out, did not run.
autoupdate_EndToEndTest.npo_delta   [ PASSED ]
autoupdate_Rollback                 [ PASSED ]

Suite timings:
Downloads started at 2017-02-21 05:33:23
Payload downloads ended at 2017-02-21 05:33:26
Suite started at 2017-02-21 05:34:06
Artifact downloads ended (at latest) at 2017-02-21 05:34:18
Testing started at 2017-02-21 05:37:50
Testing ended at 2017-02-21 05:54:41


Links to test logs:
Suite job http://cautotest/tko/retrieve_logs.cgi?job=/results/102542367-chromeos-test/
platform_Powerwash http://cautotest/tko/retrieve_logs.cgi?job=/results/102542367-chromeos-test/
autoupdate_EndToEndTest.npo_delta http://cautotest/tko/retrieve_logs.cgi?job=/results/102542579-chromeos-test/
autoupdate_Rollback http://cautotest/tko/retrieve_logs.cgi?job=/results/102542583-chromeos-test/

(Also, I don't find it very useful to have the platform_Powerwash URL point to the suite job URL)

The suite job points to the autoserv.DEBUG here:

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/102542367-chromeos-test/hostless/debug/

which shows the job getting scheduled and assigned a job ID:

02/21 05:34:27.899 DEBUG|             suite:0854| Scheduling autoupdate_EndToEndTest_npo_delta_9304.0.0
02/21 05:34:28.339 DEBUG|             suite:1206| Adding job keyval for autoupdate_EndToEndTest_npo_delta_9304.0.0=102542579-chromeos-test
02/21 05:34:28.340 DEBUG|             suite:0854| Scheduling autoupdate_Rollback
02/21 05:34:28.745 DEBUG|             suite:1206| Adding job keyval for autoupdate_Rollback=102542583-chromeos-test
02/21 05:34:28.746 DEBUG|             suite:0854| Scheduling platform_Powerwash
02/21 05:34:29.169 DEBUG|             suite:1206| Adding job keyval for platform_Powerwash=102542586-chromeos-test
02/21 05:34:29.169 DEBUG|             suite:0927| Scheduled 3 tests, writing the total to keyval.
02/21 05:34:29.170 DEBUG|     dynamic_suite:0593| Waiting on suite.

However, the bucket for that job ID is empty, and we hit a wall.