[jira] [Created] (IOTDB-6205) Fix null pointer exception of historical pending queue size in metrics

[Jira]

陈哲涵 created IOTDB-6205:
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             Summary: Fix null pointer exception of historical pending queue 
size in metrics
                 Key: IOTDB-6205
                 URL: https://issues.apache.org/jira/browse/IOTDB-6205
             Project: Apache IoTDB
          Issue Type: Improvement
            Reporter: 陈哲涵






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