Return a dictionary for each job counter
        {
          counter_group_name: [
              counter_name
            ]
          }
        }

def _parse_general_counters(self, init_config):
        """
        Return a dictionary for each job counter
        {
          counter_group_name: [
              counter_name
            ]
          }
        }
        """
        job_counter = {}

        if init_config.get('general_counters'):

            # Parse the custom metrics
            for counter_group in init_config['general_counters']:
                counter_group_name = counter_group.get('counter_group_name')
                counters = counter_group.get('counters')

                if not counter_group_name:
                    raise Exception('"general_counters" must contain a valid "counter_group_name"')

                if not counters:
                    raise Exception('"general_counters" must contain a list of "counters"')

                # Add the counter_group to the job_counters if it doesn't already exist
                if counter_group_name not in job_counter:
                    job_counter[counter_group_name] = []

                for counter in counters:
                    counter_name = counter.get('counter_name')

                    if not counter_name:
                        raise Exception('At least one "counter_name" should be specified in the list of "counters"')

                    job_counter[counter_group_name].append(counter_name)

        return job_counter