, previous_io_bytes_in :: non_neg_integer()
, previous_io_bytes_out :: non_neg_integer()
, current_io_bytes_in :: non_neg_integer()
, current_io_bytes_out :: non_neg_integer()
, previous_io_bytes_in :: non_neg_integer()
, previous_io_bytes_out :: non_neg_integer()
, current_io_bytes_in :: non_neg_integer()
, current_io_bytes_out :: non_neg_integer()