docs: def logging_feature(app):
      """
      Add logging
      Accepts flask application and registers logging functionality within it
      """
  
      # this is important because otherwise only log warn, err and crit
      app.logger.setLevel(logging.INFO)
  
      # enable loggers
      email_exceptions = app.config.get('LOGGING_EMAIL_EXCEPTIONS_TO_ADMINS')
      if email_exceptions and not app.debug and not app.testing:
          # config.debug=False
          mail_handler = mail_logger(app)
          app.logger.addHandler(mail_handler)
  
      if not app.testing:
          file_handler = file_logger(app)
          app.logger.addHandler(file_handler)