def check_environment_var_existance(self):
        """To verify that all required environment variables are exist.

        Raises:
            ExtraHopException: raise exception if any of the required environment variable is not set.
        """
        __method_name = inspect.currentframe().f_code.co_name
        try:
            applogger.debug(
                "{}(method={}) Checking environment variables are exist or not.".format(
                    self.logs_starts_with, __method_name
                )
            )
            if DETECTIONS_TABLE_NAME is None:
                raise ExtraHopException(
                    "DetectionsTableName is not set in the environment please set the environment variable."
                )
            applogger.debug(
                "{}(method={}) All custom environment variable exists.".format(
                    self.logs_starts_with, __method_name
                )
            )
        except ExtraHopException as err:
            applogger.error(
                "{}".format(
                    self.error_logs.format(self.logs_starts_with, __method_name, err)
                )
            )
            raise ExtraHopException(err)
        except Exception as err:
            applogger.error(
                "{}".format(
                    self.error_logs.format(self.logs_starts_with, __method_name, err)
                )
            )
            raise ExtraHopException(err)
To verify that all required environment variables are exist.

        Raises:
            ExtraHopException: raise exception if any of the required environment variable is not set.
        
Solutions/ExtraHop/Data Connectors/ExtraHopDataConnector/ExtraHopSentinelActivity/extrahop.py