Here's the failure I got after patch1 of https://chrome-internal-review.googlesource.com/367968

$ ./ccompute_config.py train
Traceback (most recent call last):
  File "./ccompute_config.py", line 782, in <module>
    machine_type='n1-standard-8', zone='us-east1-a'))
  File "./ccompute_config.py", line 321, in __init__
    kwargs.update(pool.get(instance))
  File "./ccompute_config.py", line 257, in get
    new_instance['external_ip'] = self.ips.pop(0)
IndexError: pop from empty list


dgarrett tells me this is because we our out of capacity in easy.

The failure should make that clear.