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  1. Hadoop HDFS
  2. HDFS-17301

Add read and write dataXceiver threads count metrics to datanode.

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      1. The DataNodeActiveXeiversCount metric contains the number of threads of all Op types.
      2. In most cases, we focus more on the number of read and write dataXceiver threads, so add read and write dataXceiver threads count metrics to datanode.

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            huangzhaobo99 Zhaobo Huang Assign to me
            huangzhaobo99 Zhaobo Huang
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