Github user zentol closed the pull request at:
https://github.com/apache/flink/pull/3103
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GitHub user zentol opened a pull request:
https://github.com/apache/flink/pull/3103
[FLINK-5464] [metrics] Prevent some NPEs
This PR prevents some NullPointerExceptions from occurring in the metric
system.
- When registering a metric that is null the metric is ignored, and
