[jira] [Created] (FLINK-4064) Allow calling MetricGroup methods multiple times

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-4064:
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             Summary: Allow calling MetricGroup methods multiple times
                 Key: FLINK-4064
                 URL: https://issues.apache.org/jira/browse/FLINK-4064
             Project: Flink
          Issue Type: Sub-task
          Components: Metrics
    Affects Versions: 1.1.0
            Reporter: Aljoscha Krettek


Right now, the methods on {{MetricGroup}} can only be called once, i.e. I have to keep the result of {{MetricGroup.counter(name)}} and use that to report metrics. For some cases, such as adding metrics support in triggers, it is necessary to allow calling a method multiple times and return the same metric object. On the first call, a new metric object would be created, subsequent calls would return that metric object.



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