I tried run_puppet manually in server51, and found following error. Don't see it's causing any issue particular, but it is something we might want to fix.

Failed to find servers
    No server is found.
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/root/chromeos-admin/venv/admin/scripts/is_prod_machine.py", line 93, in <module>
  File "/root/chromeos-admin/venv/admin/scripts/is_prod_machine.py", line 30, in main
  File "/root/chromeos-admin/venv/admin/scripts/is_prod_machine.py", line 56, in _is_prod
  File "/root/chromeos-admin/venv/admin/scripts/is_prod_machine.py", line 70, in _is_prod_using_atest
  File "/root/chromeos-admin/venv/admin/atest.py", line 49, in get_prod_hostnames
  File "/root/chromeos-admin/venv/admin/atest.py", line 60, in _get_server_list
  File "/usr/lib/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 384, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded


For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.