glean_parser/schemas/metrics.1-0-0.schema.yaml [393:409]:
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      histogram_type:
        title: Histogram type
        description: |
          The type of histogram bucketing to use:
            - `linear`: The buckets are linearly spaced within the range.
            - `exponential`: The buckets use the natural logarithmic so the
              smaller-valued buckets are smaller in size than the higher-valued
              buckets.

          Required when `type`_ is `custom_distribution`.
        enum:
          - linear
          - exponential

      unit:
        title: Unit
        description: |
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glean_parser/schemas/metrics.2-0-0.schema.yaml [446:462]:
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      histogram_type:
        title: Histogram type
        description: |
          The type of histogram bucketing to use:
            - `linear`: The buckets are linearly spaced within the range.
            - `exponential`: The buckets use the natural logarithmic so the
              smaller-valued buckets are smaller in size than the higher-valued
              buckets.

          Required when `type`_ is `custom_distribution`.
        enum:
          - linear
          - exponential

      unit:
        title: Unit
        description: |
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