How to use the opentelemetry-api.src.opentelemetry.metrics.__init__.Meter function in opentelemetry-api

def get_label_set(self, labels: Dict[str, str]) -> "LabelSet":
        """Gets a `LabelSet` with the given labels.

        Args:
            labels: A dictionary representing label key to label value pairs.

        Returns: A `LabelSet` object canonicalized using the given input.
        """
        # pylint: disable=no-self-use
        return DefaultLabelSet()


# Once https://github.com/python/mypy/issues/7092 is resolved,
# the following type definition should be replaced with
# from opentelemetry.util.loader import ImplementationFactory
ImplementationFactory = Callable[[Type[Meter]], Optional[Meter]]

_METER = None
_METER_FACTORY = None


def meter() -> Meter:
    """Gets the current global :class:`~.Meter` object.

    If there isn't one set yet, a default will be loaded.
    """
    global _METER, _METER_FACTORY  # pylint:disable=global-statement

    if _METER is None:
        # pylint:disable=protected-access
        _METER = loader._load_impl(Meter, _METER_FACTORY)
        del _METER_FACTORY

def meter() -> Meter:
    """Gets the current global :class:`~.Meter` object.

    If there isn't one set yet, a default will be loaded.
    """
    global _METER, _METER_FACTORY  # pylint:disable=global-statement

    if _METER is None:
        # pylint:disable=protected-access
        _METER = loader._load_impl(Meter, _METER_FACTORY)
        del _METER_FACTORY

    return _METER