Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4035
change looks good but fails the new checkstyle rules:
```
[INFO] There are 4 errors reported by Checkstyle 6.19 with
/tools/maven/strict-checkstyle.xml ruleset.
[ERROR]
src/test/java/org/apache/flink/runtime/metrics/MetricRegistryTest.java:[256]
(whitespace) EmptyLineSeparator: There is more than 1 empty line one after
another.
[ERROR]
src/test/java/org/apache/flink/runtime/metrics/MetricRegistryTest.java:[259]
(regexp) RegexpSingleline: Trailing whitespace
[ERROR]
src/test/java/org/apache/flink/runtime/metrics/MetricRegistryTest.java:[265]
(whitespace) EmptyLineSeparator: There is more than 1 empty line one after
another.
[ERROR]
src/test/java/org/apache/flink/runtime/metrics/MetricRegistryTest.java:[278]
(regexp) RegexpSingleline: Trailing whitespace
```
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