[jira] [Created] (KUDU-2655) Add metrics for metadata directory I/O

[Will Berkeley (JIRA)]

Will Berkeley created KUDU-2655:
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             Summary: Add metrics for metadata directory I/O
                 Key: KUDU-2655
                 URL: https://issues.apache.org/jira/browse/KUDU-2655
             Project: Kudu
          Issue Type: Improvement
          Components: metrics
    Affects Versions: 1.8.0
            Reporter: Will Berkeley
            Assignee: Will Berkeley


There's good metrics for block manager (data dir) and WAL operations, like 
{{block_manager_total_bytes_written}}, {{block_manager_total_bytes_read}}, 
{{log_bytes_logged }}, and the {{log_append_latency}} histogram. What we are 
missing are metrics about the amount of metadata I/O. It'd be nice to add

* metadata_bytes_read
* metadata_bytes_written
* latency histograms for bytes read and bytes written



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