[GitHub] flink pull request #5182: [FLINK-8162] [kinesis-connector] Emit Kinesis' mil...

[zentol]

Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5182#discussion_r160132296
  
    --- Diff: 
flink-metrics/flink-metrics-core/src/main/java/org/apache/flink/metrics/groups/UnregisteredMetricsGroup.java
 ---
    @@ -107,7 +107,7 @@ public MetricGroup addGroup(String key, String value) {
     
        @Override
        public Map<String, String> getAllVariables() {
    -           return Collections.emptyMap();
    +           return new HashMap<>();
    --- End diff --
    
    is this change necessary?


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