robertwb commented on a change in pull request #12883:
URL: https://github.com/apache/beam/pull/12883#discussion_r498569928



##########
File path: sdks/python/apache_beam/metrics/metric.py
##########
@@ -101,23 +121,26 @@ def gauge(namespace, name):
   class DelegatingCounter(Counter):
     """Metrics Counter that Delegates functionality to MetricsEnvironment."""
     def __init__(self, metric_name):
+      # type: (MetricName) -> None
       super(Metrics.DelegatingCounter, self).__init__()
       self.metric_name = metric_name
-      self.inc = MetricUpdater(cells.CounterCell, metric_name, default=1)
+      self.inc = MetricUpdater(cells.CounterCell, metric_name, default=1)  # 
type: ignore[assignment]

Review comment:
       Yes, please go ahead and ignore this error. (Note also that this code is 
structured in this way for performance reasons; previously we had pipelines 
where the bulk of the CPU was spent in generic counter update code, whereas 
here MetricUpdater is as fast as possible for incrementing an int).




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