code: func (r *Reporter) Sample(name string, tags []string, dist instruments.Distribution) error {
  	r.Metric(name+".p95", tags, float32(dist.Quantile(0.95)))
  	r.Metric(name+".p99", tags, float32(dist.Quantile(0.99)))
  	return nil
  }
docs: // Sample implements instruments.Reporter