[jira] [Created] (IOTDB-3394) [metric] add metrics of cache hit rate.

[Jira]

张洪胤 created IOTDB-3394:
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             Summary: [metric] add metrics of cache hit rate.
                 Key: IOTDB-3394
                 URL: https://issues.apache.org/jira/browse/IOTDB-3394
             Project: Apache IoTDB
          Issue Type: New Feature
            Reporter: 张洪胤
            Assignee: 张洪胤


Add metrics of cache hit rate.



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