Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4109
no, it's not safe nor does it actually fulfill the purpose. I better add a
test for this....
We can't just fail, as the metric system shouldn't throw exceptions, since
this isn't a problem that affects job execution.
I've moved the truncation into `TaskMetricGroup#addOperator()` which is the
only call to the constructor outside of tests (as intended).
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