code: public static MetricAggregate fromMetricIdentity(final MetricIdentity identity, final long currentMinute) {
  		Preconditions.checkNotNull(identity);
  		return new MetricAggregate(identity, currentMinute);
  	}
docs: Creates a MetricAggregate
  @param identity The metric identity
  @param currentMinute Current minute
  @return The MetricAggregate