Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4110
We don't truncate the full identifier, but each individual component before
assembling the final identifier.
I.e. `a.b.<reallyReallyLongSection>.c.d` would become
`a.b.<notSoLongSection>.c.d`.
The primary cause of this currently are the names of WindowOperators or
long task chains; but given that the sections are partially controlled by the
user there may be more cases.
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