Astarte.DataAccess.Config.put_astarte_instance_id

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

put_astarte_instance_id(value, namespace \\ nil)

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Specs

put_astarte_instance_id(binary(), Skogsra.Env.namespace()) ::
  :ok | {:error, binary()}

Puts the value to Astarte.DataAccess.Config.astarte_instance_id/0. Optionally, receives the namespace.