Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/3611
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GitHub user zentol opened a pull request:
https://github.com/apache/flink/pull/3611
[backport] [FLINK-6183]/[FLINK-6184] Prevent some NPE and unclosed metric
groups
Backport of #3610 for 1.2 .
You can merge this pull request into a Git repository by running:
$ git pull
