Astarte.DataAccess.Device.interface_version

You're seeing just the function interface_version, go back to Astarte.DataAccess.Device module for more information.
Link to this function

interface_version(client, device_id, interface)

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Specs

interface_version(:cqerl.client(), Astarte.Core.Device.device_id(), String.t()) ::
  {:ok, integer()} | {:error, atom()}