# register method

void register (Metric metric)

Register Metrics to make them visible to Observatory.

## Implementation

    static void register(Metric metric) {
      if (metric is! Metric) {
        throw new ArgumentError('metric must be a Metric');
      }
      if (_metrics[metric.name] != null) {
        throw new ArgumentError('Registered metrics have unique names');
      }
      _metrics[metric.name] = metric;
    }