title: Gunicorn Command Line Error inGoogle App Engine Standard Environment
body: <p>I'm getting an endless stream of the following errors after deploying a Flask/Python3/Postgres app to app engine standard environment. The warning about Psycopg2 package is of concern, but not what's causing the app to fail to run. Rather, it's the invalid command line arguments to gunicorn, which are supplied by GAE, not by me. Is anyone able to deploy a Python3 Flask that uses Postgres to the Standard environment successfully?</p>
  
  <p>Here's the log file output:</p>
  
  <pre><code>2018-12-11 02:51:37 +0000] [3738] [INFO] Booting worker with pid: 3738
  2018-12-11 02:51:37 default[20181210t140744]  /env/lib/python3.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: &lt;http://initd.org/psycopg/docs/install.html#binary-install-from-pypi&gt;.
  2018-12-11 02:51:37 default[20181210t140744]    """)
  2018-12-11 02:51:38 default[20181210t211942]  usage: gunicorn [-h] [--debug] [--args]
  2018-12-11 02:51:38 default[20181210t211942]  gunicorn: error: unrecognized arguments: main:app --workers 1 -c /config/gunicorn.py
  2018-12-11 02:51:38 default[20181210t211942]  [2018-12-11 02:51:38 +0000] [882] [INFO] Worker exiting (pid: 882)
  </code></pre>