Neilxzn opened a new pull request #3999:
URL: https://github.com/apache/hadoop/pull/3999
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### Description of PR
https://issues.apache.org/jira/browse/HDFS-16459
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="xxxx"}
2
```
### How was this patch tested?
no new test
### For code changes:
1. DefaultMetricsSystem.instance().register
2. use `@Metric` to export metrics
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