code: func AlertTemplateData(labels map[string]string, externalLabels map[string]string, value float64) interface{} {
  	return struct {
  		Labels         map[string]string
  		ExternalLabels map[string]string
  		Value          float64
  	}{
  		Labels:         labels,
  		ExternalLabels: externalLabels,
  		Value:          value,
  	}
  }
docs: // AlertTemplateData returns the interface to be used in expanding the template.