DBConnection.Ownership.ownership_mode

You're seeing just the function ownership_mode, go back to DBConnection.Ownership module for more information.
Link to this function

ownership_mode(manager, mode, opts)

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Specs

ownership_mode(
  GenServer.server(),
  :auto | :manual | {:shared, pid()},
  Keyword.t()
) :: :ok | :already_shared | :not_owner | :not_found

Changes the ownership mode.

mode may be :auto, :manual or {:shared, owner}.

The operation will always succeed when setting the mode to :auto or :manual. It may fail with reason :not_owner or :not_found when setting {:shared, pid} and the given pid does not own any connection. May return :already_shared if another process set the ownership mode to {:shared, _} and is still alive.