METRIC_METADATA
if (i == METRIC_METADATA)
sum = m->metric[METRIC_METADATA].latency_sum;
ktime_to_ceph_timespec(&meta->avg, m->metric[METRIC_METADATA].latency_avg);
meta->sq_sum = cpu_to_le64(m->metric[METRIC_METADATA].latency_sq_sum);
meta->count = cpu_to_le64(m->metric[METRIC_METADATA].total);
ceph_update_metrics(&m->metric[METRIC_METADATA],