This started to happen on Apr. 17:

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/113164846-chromeos-test/chromeos2-row3-rack9-host5/telemetry_AFDOGenerate/debug/

Previous build, with the same run_benchmark command line options (including the hostname), passed:

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/113048177-chromeos-test/chromeos2-row3-rack9-host5/telemetry_AFDOGenerate/debug/

The run_benchmark command is:

python /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/run_benchmark --verbose --browser=cros-chrome --output-format=chartjson --output-dir=/home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src --remote=chromeos2-row3-rack9-host5 --pageset-repeat=1 page_cycler_v2.typical_25

The hostname seems to only work on devservers. Is there any change to devserver recently?

BTW, I only see this happening on R58.

Logs:

04/17 20:14:00.661 DEBUG|        base_utils:0185| Running 'ssh 100.115.245.198 python /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/run_benchmark --verbose --browser=cros-chrome --output-format=chartjson --output-dir=/home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src --remote=chromeos2-row3-rack9-host5 --pageset-repeat=1 page_cycler_v2.typical_25'
04/17 20:14:05.674 DEBUG|  telemetry_runner:0284| Error occurred executing.
04/17 20:14:05.675 DEBUG|  telemetry_runner:0290| Completed with exit code: 1.
stdout:
stderr:ERROR:root:Fail to create platform instance for ChromeOs with host chromeos2-row3-rack9-host5.
INFO:root:Try printing formatted exception: <class 'telemetry.internal.browser.browser_finder_exceptions.BrowserFinderException'> Unable to resolve the hostname for: chromeos2-row3-rack9-host5 <traceback object at 0x7f8580974518>

Traceback (most recent call last):
  <module> at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/run_benchmark:22
    sys.exit(main())
  main at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/run_benchmark:19
    return benchmark_runner.main(config, [trybot_command.Trybot])
  main at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/benchmark_runner.py:432
    return command_instance.Run(options)
  Run at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/benchmark_runner.py:245
    return min(255, self._benchmark().Run(args))
  Run at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/benchmark.py:91
    return story_runner.RunBenchmark(self, finder_options)
  RunBenchmark at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py:304
    benchmark.CustomizeBrowserOptions(finder_options.browser_options)
  CustomizeBrowserOptions at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/core/perf_benchmark.py:40
    variations = self._GetVariationsBrowserArgs(options.finder_options)
  _GetVariationsBrowserArgs at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/tools/perf/core/perf_benchmark.py:57
    possible_browser = browser_finder.FindBrowser(finder_options)
  Cacher at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/decorators.py:34
    cacher.__cache[key] = obj(*args, **kwargs)
  FindBrowser at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/browser/browser_finder.py:70
    curr_browsers = finder.FindAllAvailableBrowsers(options, device)
  FindAllAvailableBrowsers at /home/chromeos-test/images/samus-pre-flight-branch/R58-9334.51.0-rc2/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py:115
    raise browser_finder_exceptions.BrowserFinderException(str(ex))
BrowserFinderException: Unable to resolve the hostname for: chromeos2-row3-rack9-host5