'Get the system counters for calculating node utilization.'

def _get_node_utilization_system_counters(self, node_name):

    system_instance_uuids = self.zapi_client.get_performance_instance_uuids(self.system_object_name, node_name)
    system_counter_names = ['avg_processor_busy', self.avg_processor_busy_base_counter_name]
    if ('cpu_elapsed_time1' in system_counter_names):
        system_counter_names.append('cpu_elapsed_time')
    system_counters = self.zapi_client.get_performance_counters(self.system_object_name, system_instance_uuids, system_counter_names)
    return system_counters
