docs: def CreateGaugeMetadata(metric_name,
                          value_type,
                          fields=None,
                          docstring=None,
                          units=None):
    """Helper function for creating MetricMetadata for gauge metrics."""
    return rdf_stats.MetricMetadata(
        varname=metric_name,
        metric_type=rdf_stats.MetricMetadata.MetricType.GAUGE,
        value_type=MetricValueTypeFromPythonType(value_type),
        fields_defs=FieldDefinitionProtosFromTuples(fields or []),
        docstring=docstring,
        units=units)