@type t() :: %PolarExpress.Schemas.MeterUpdate{
  aggregation:
    PolarExpress.Schemas.CountAggregation.t()
    | PolarExpress.Schemas.PropertyAggregation.t()
    | PolarExpress.Schemas.UniqueAggregation.t()
    | nil,
  filter: PolarExpress.Schemas.Filter.t() | nil,
  is_archived: boolean() | nil,
  metadata:
    %{
      required(String.t()) => String.t() | integer() | float() | boolean() | nil
    }
    | nil,
  name: String.t() | nil
}

• aggregation - The aggregation to apply on the filtered events to calculate the meter. Nullable.
• filter - The filter to apply on events that'll be used to calculate the meter. Nullable.
• is_archived - Whether the meter is archived. Archived meters are no longer used for billing. Nullable.
• metadata - Key-value object allowing you to store additional information.

The key must be a string with a maximum length of 40 characters. The value must be either:

• A string with a maximum length of 500 characters
• An integer
• A floating-point number
• A boolean

You can store up to 50 key-value pairs.

• name - The name of the meter. Will be shown on customer's invoices and usage. Nullable.