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add the activity metrics from hdfs datanode #1225

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leochen4891
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More datanode metrics should be included.
Metrics like ReadBlockOpAvgTime or BytesRead is likely to help in case of debugging hotspot or slowness.

@cbaenziger
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Awesome! We probably do not need the ramdisk metrics for many usecases? (But good to leave for the VM builds.)

@cbaenziger cbaenziger merged commit 3d29119 into bloomberg:master Jun 6, 2018
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