Akira Ajisaka created HADOOP-16495:
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             Summary: Fix invalid metric types in PrometheusMetricsSink
                 Key: HADOOP-16495
                 URL: https://issues.apache.org/jira/browse/HADOOP-16495
             Project: Hadoop Common
          Issue Type: Bug
          Components: metrics
            Reporter: Akira Ajisaka


There are some scraping error when using '/prom' endpoint:
 * invalid metric type "_young _generation counter"
 * invalid metric type "_old _generation counter"
 * invalid metric type 
"apache.hadoop.hdfs.server.datanode.fsdataset.impl._fs_dataset_impl_dfs_used 
gauge"



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