[jira] [Created] (FLINK-6053) Gauge<T> should only take subclasses of Number, rather than everything

[Shang Yuanchun (Jira)]

Bowen Li created FLINK-6053:
-------------------------------

             Summary: Gauge<T> should only take subclasses of Number, rather than everything
                 Key: FLINK-6053
                 URL: https://issues.apache.org/jira/browse/FLINK-6053
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
    Affects Versions: 1.2.0
            Reporter: Bowen Li
             Fix For: 1.3.0


Currently, Flink's Gauge is defined as

```
/**
 * A Gauge is a {@link Metric} that calculates a specific value at a point in time.
 */
public interface Gauge<T> extends Metric {
        T getValue();
}
```

But it doesn't make sense to have Gauge take generic types other than Number. So the class should be like

```
/**
 * A Gauge is a {@link Metric} that calculates a specific value at a point in time.
 */
public interface Gauge<T extends Number> extends Metric {
        T getValue();
}
```



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