'Get all performance counters for calculating node utilization.'

def _get_node_utilization_counters(self, node_name):

    try:
        return ((self._get_node_utilization_system_counters(node_name) + self._get_node_utilization_wafl_counters(node_name)) + self._get_node_utilization_processor_counters(node_name))
    except netapp_api.NaApiError:
        LOG.exception('Could    not    get    utilization    counters    from    node    %s', node_name)
        return None
