Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3106
@StephanEwen I'll add the default initialization of ```counter``` while
merging.
Typing the counters to a ```SimpleCounter``` would affect a lot of other
classes though (especially since we can extend this to the
```OperatorIOMetricGroup```), so I would like to do that as part of another
issue.
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