API refactor

venv/lib/python3.12/site-packages/kafka/metrics/stats/rate.py

@@ -37,6 +37,8 @@ class Rate(AbstractMeasurableStat):
     occurrences (e.g. the count of values measured over the time interval)
     or other such values.
     """
+    __slots__ = ('_stat', '_unit')
+
     def __init__(self, time_unit=TimeUnit.SECONDS, sampled_stat=None):
         self._stat = sampled_stat or SampledTotal()
         self._unit = time_unit
@@ -105,6 +107,7 @@ class Rate(AbstractMeasurableStat):
 
 
 class SampledTotal(AbstractSampledStat):
+    __slots__ = ('_initial_value', '_samples', '_current')
     def __init__(self, initial_value=None):
         if initial_value is not None:
             raise ValueError('initial_value cannot be set on SampledTotal')