Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2134#discussion_r68255328
--- Diff:
flink-core/src/main/java/org/apache/flink/metrics/groups/AbstractMetricGroup.java
---
@@ -146,7 +147,16 @@ public Counter counter(int name) {
@Override
public Counter counter(String name) {
- Counter counter = new Counter();
+ return counter(name, new SimpleCounter());
+ }
+
+ @Override
+ public <C extends Counter> C counter(int name, C counter) {
--- End diff --
users can write ```MyCounter c = metricGroup.addCounter("myC", new
MyCounter());```
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