public Builder apiGroup(@Nullable Output<String> apiGroup) {
            $.apiGroup = apiGroup;
            return this;
        }
@param apiGroup APIGroup is the group for the resource being referenced. It is empty for the core API. This matches the group in the APIVersion that is used when creating the resources.

@return builder
sdk/java/src/main/java/com/pulumi/kubernetes/resource/v1alpha1/inputs/ResourceClassParametersReferenceArgs.java