code: func (h *hawkularSink) recent(live *metrics.MetricDefinition, model *metrics.MetricDefinition) bool {
  	recent := true
  	for k := range model.Tags {
  		if v, found := live.Tags[k]; !found {
  			// There's a label that wasn't in our stored definition
  			live.Tags[k] = v
  			recent = false
  		}
  	}
  
  	return recent
  }
docs: // Checks that stored definition is up to date with the model