This CQ run failed in CommitQueueHandleChanges:
    https://uberchromegw.corp.google.com/i/chromeos/builders/master-paladin/builds/17467

The log of the failure is here:
    https://logs.chromium.org/v/?s=chromeos%2Fbb%2Fchromeos%2Fmaster-paladin%2F17467%2F%2B%2Frecipes%2Fsteps%2FCommitQueueHandleChanges%2F0%2Fstdout

This is the relevant error from the logs:
[1;31m01:12:06: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 128; command: git fetch -f https://chromium-review.googlesource.com/chromiumos/platform/system_api
fatal: unable to access 'https://chromium-review.googlesource.com/chromiumos/platform/system_api/': Couldn't connect to server
cmd=['git', 'fetch', '-f', u'https://chromium-review.googlesource.com/chromiumos/platform/system_api'], cwd=/b/c/cbuild/repository/src/platform/system_api
Traceback (most recent call last):
  File "/b/c/cbuild/repository/chromite/lib/parallel.py", line 603, in TaskRunner
    task(*x, **task_kwargs)
  File "/b/c/cbuild/repository/chromite/lib/parallel.py", line 801, in <lambda>
    fn = lambda idx, task_args: out_queue.put((idx, task(*task_args)))
  File "/b/c/cbuild/repository/chromite/cbuildbot/patch_series.py", line 139, in _FetchChangesForRepo
    git.RunGit(repo, cmd, print_cmd=True)
  File "/b/c/cbuild/repository/chromite/lib/git.py", line 819, in RunGit
    ['git'] + cmd, **kwargs)
  File "/b/c/cbuild/repository/chromite/lib/retry_util.py", line 244, in GenericRetry
    return _run()
  File "/b/c/cbuild/repository/chromite/lib/retry_util.py", line 177, in _Wrapper
    ret = func(*args, **kwargs)
  File "/b/c/cbuild/repository/chromite/lib/retry_util.py", line 243, in _run
    return functor(*args, **kwargs)
  File "/b/c/cbuild/repository/chromite/lib/cros_build_lib.py", line 654, in RunCommand
    raise RunCommandError(msg, cmd_result)
RunCommandError: return code: 128; command: git fetch -f https://chromium-review.googlesource.com/chromiumos/platform/system_api
fatal: unable to access 'https://chromium-review.googlesource.com/chromiumos/platform/system_api/': Couldn't connect to server
cmd=['git', 'fetch', '-f', u'https://chromium-review.googlesource.com/chromiumos/platform/system_api'], cwd=/b/c/cbuild/repository/src/platform/system_api

Marking P3 for now, as the problem hasn't recurred.