code: private static <L> void populateMetricTypesForResourceType(
              ResourceType.Builder<?, L> resourceTypeBuilder,
              TypeSets.Builder<L> typeSetsBuilder) {
  
          Map<Name, TypeSet<MetricType<L>>> metricTypeSets = typeSetsBuilder.getMetricTypeSets();
          List<Name> metricSetNames = resourceTypeBuilder.getMetricSetNames();
          for (Name metricSetName : metricSetNames) {
              TypeSet<MetricType<L>> metricSet = metricTypeSets.get(metricSetName);
              if (metricSet != null && metricSet.isEnabled()) {
                  resourceTypeBuilder.metricTypes(metricSet.getTypeMap().values());
              }
          }
  
      }
docs: Given a resource type builder, this will fill in its metric types.
  
  @param resourceTypeBuilder the type being built whose metric types are to be filled in
  @param typeSetsBuilder all type metadata - this is where our metrics are