Max  Xie created HDFS-16459:
-------------------------------

             Summary: RBF: register RBFMetrics in MetricsSystem for 
promethuessink
                 Key: HDFS-16459
                 URL: https://issues.apache.org/jira/browse/HDFS-16459
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: rbf
    Affects Versions: 3.4.0
            Reporter: Max  Xie
            Assignee: Max  Xie


Router' RBFMetrics was not register  in MetricsSystem. We can't find these 
metrics from PrometheusSink. Maybe we should fix it. 

 

After fix it ,  some  RBFMetrics will export like this 

```

# HELP rbf_metrics_current_tokens_count Number of router's current tokens # 
TYPE rbf_metrics_current_tokens_count gauge 
rbf_metrics_current_tokens_count\{processname="Router",context="dfs",hostname="xxx"}
 123

``` 



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