    def add_metric(self, labels: Sequence[str], value: float, timestamp: Optional[Union[Timestamp, float]] = None) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          value: A float
        """
        self.samples.append(Sample(self.name, dict(zip(self._labelnames, labels)), value, timestamp))
Add a metric to the metric family.

Args:
labels: A list of label values
value: A float
prometheus_client/metrics_core.py