code: func (*MetricsData) XXX_OneofWrappers() []interface{} {
  	return []interface{}{
  		(*MetricsData_BoolValue)(nil),
  		(*MetricsData_StringValue)(nil),
  		(*MetricsData_Int64Value)(nil),
  		(*MetricsData_DoubleValue)(nil),
  		(*MetricsData_DistributionValue)(nil),
  	}
  }
docs: // XXX_OneofWrappers is for the internal use of the proto package.