Membrane.Buffer.Metric.split_buffers

You're seeing just the callback split_buffers, go back to Membrane.Buffer.Metric module for more information.
Link to this callback

split_buffers(arg1, non_neg_integer)

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Specs

split_buffers(
  [%Membrane.Buffer{metadata: term(), payload: term()}] | [],
  non_neg_integer()
) ::
  {[%Membrane.Buffer{metadata: term(), payload: term()}] | [],
   [%Membrane.Buffer{metadata: term(), payload: term()}] | []}