}
	for i := 0; i < len(labels); i += 2 {
		mg.ExtraLabels[labels[i]] = labels[i+1]
	}
}

// IsBucketMetricsGroup - returns true if the given MetricsGroup is a bucket
// metrics group.
func (mg *MetricsGroup) IsBucketMetricsGroup() bool {
	return mg.bucketLoader != nil
}

// Describe - implements prometheus.Collector interface.