docs: static MetricDescriptor createMetricDescriptor(
        io.opencensus.metrics.export.MetricDescriptor metricDescriptor,
        String projectId,
        String domain,
        String displayNamePrefix,
        Map<LabelKey, LabelValue> constantLabels) {
  
      MetricDescriptor.Builder builder = MetricDescriptor.newBuilder();
      String type = generateType(metricDescriptor.getName(), domain);
      // Name format refers to
      // cloud.google.com/monitoring/api/ref_v3/rest/v3/projects.metricDescriptors/create
      builder.setName("projects/" + projectId + "/metricDescriptors/" + type);
      builder.setType(type);
      builder.setDescription(metricDescriptor.getDescription());
      builder.setDisplayName(createDisplayName(metricDescriptor.getName(), displayNamePrefix));
      for (LabelKey labelKey : metricDescriptor.getLabelKeys()) {
        builder.addLabels(createLabelDescriptor(labelKey));
      }
      for (LabelKey labelKey : constantLabels.keySet()) {
        builder.addLabels(createLabelDescriptor(labelKey));
      }
  
      builder.setUnit(metricDescriptor.getUnit());
      builder.setMetricKind(createMetricKind(metricDescriptor.getType()));
      builder.setValueType(createValueType(metricDescriptor.getType()));
      return builder.build();
    }