Emailservice is failing on a non-GKE cluster

Is there a way to disable the use of GOOGLE_APPLICATION_CREDENTIALS so that the app can be deployed in a non-GKE cluster? Thanks.

{"timestamp": 1585492106.3320029, "severity": "INFO", "name": "emailservice-server", "message": "starting the email service in dummy mode."}
{"timestamp": 1585492106.3322504, "severity": "INFO", "name": "emailservice-server", "message": "Profiler disabled."}
{"timestamp": 1585492106.3323855, "severity": "INFO", "name": "emailservice-server", "message": "Tracing enabled."}
Traceback (most recent call last):
  File "email_server.py", line 190, in <module>
    transport=AsyncTransport)
  File "/usr/local/lib/python3.7/site-packages/opencensus/trace/exporters/stackdriver_exporter.py", line 199, in __init__
    client = Client(project=project_id)
  File "/usr/local/lib/python3.7/site-packages/google/cloud/trace/client.py", line 43, in __init__
    super(Client, self).__init__(project=project, credentials=credentials)
  File "/usr/local/lib/python3.7/site-packages/google/cloud/client.py", line 223, in __init__
    _ClientProjectMixin.__init__(self, project=project)
  File "/usr/local/lib/python3.7/site-packages/google/cloud/client.py", line 175, in __init__
    project = self._determine_default(project)
  File "/usr/local/lib/python3.7/site-packages/google/cloud/client.py", line 190, in _determine_default
    return _determine_default_project(project)
  File "/usr/local/lib/python3.7/site-packages/google/cloud/_helpers.py", line 186, in _determine_default_project
    _, project = google.auth.default()
  File "/usr/local/lib/python3.7/site-packages/google/auth/_default.py", line 306, in default
    raise exceptions.DefaultCredentialsError(_HELP_MESSAGE)
google.auth.exceptions.DefaultCredentialsError: Could not automatically determine credentials. Please set GOOGLE_APPLICATION_CREDENTIALS or explicitly create credentials and re-run the application. For more information, please see https://cloud.google.com/docs/authentication/getting-started

[meetbinoy]

Uncomment following variables in kubernetes-manifests

- name: DISABLE_TRACING
   value: "1"
- name: DISABLE_PROFILER
  value: "1"

[huikang]

@nikos9742 , fyi, uncommenting tracing and profiler works for me.