Send error to StackDriver Error Reporting service. See https://cloud.google.com/error-reporting/docs/setup/app-engine-flexible-environment

gae-flex-stackdriver-log-exception.py

STACKDRIVER_ERROR_FILE = '/var/log/app_engine/custom_logs/errors.log.json'

def log_stackdriver_err(request=None, exception=None, user=None):
    '''
    send error to StackDriver Error Reporting service
    see https://cloud.google.com/error-reporting/docs/setup/app-engine-flexible-environment
    '''

    def make_path_to_file(filename):
        if not os.path.exists(os.path.dirname(filename)):
            try:
                os.makedirs(os.path.dirname(filename), 0777)
            except OSError as exc:
                if exc.errno != errno.EEXIST:
                    raise
    we_are_on_gae = 'GAE_MODULE_VERSION' in os.environ
    if we_are_on_gae:
        # https://cloud.google.com/error-reporting/docs/formatting-error-messages
        data = {
            'eventTime': datetime.datetime.utcnow().isoformat()+'000Z',
            'serviceContext': {
            'service': 'default',
                'version': os.environ.get('GAE_MODULE_VERSION')
            },
            'message': traceback.format_exc() if exception \
                                              else traceback.format_stack(),
            'context': {}
        }
        if request:
            data['context']['httpRequest'] = {
                'method': request.method,
                'url': request.url,
                'userAgent': request.user_agent,
                'referrer': request.referrer,
                'remoteIp': request.remote_addr
            }
        if user:
            data['context']['user'] = u'#{}: {} <{}>'.format(user.user_id,
                                                            user.full_name,
                                                            user.email)
        make_path_to_file(STACKDRIVER_ERROR_FILE)
        with open(STACKDRIVER_ERROR_FILE, 'a+') as file:
            file.write('\n'+json.dumps(data))