# Source code for opentelemetry.sdk.metrics._internal.exemplar.exemplar

    # Copyright The OpenTelemetry Authors
    # SPDX-License-Identifier: Apache-2.0

    import dataclasses

    from opentelemetry.util.types import Attributes

    @dataclasses.dataclass(frozen=True)
    class Exemplar:
        """A representation of an exemplar, which is a sample input measurement.

        Exemplars also hold information about the environment when the measurement
        was recorded, for example the span and trace ID of the active span when the
        exemplar was recorded.

        Attributes:
            trace_id: (optional) The trace associated with a recording
            span_id: (optional) The span associated with a recording
            time_unix_nano: The time of the observation
            value: The recorded value
            filtered_attributes: A set of filtered attributes which provide additional insight into the Context when the observation was made.

        References:
            https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/data-model.md#exemplars
            https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplar
        """

        filtered_attributes: Attributes
        value: int | float
        time_unix_nano: int
        span_id: int | None = None
        trace_id: int | None = None