lifeSo commented on issue #1189:
URL: 
https://github.com/apache/incubator-uniffle/issues/1189#issuecomment-1859203371

   > Can this metric, `jvm_buffer_pool_used_bytes{pool="direct"}`, be used to 
monitor direct memory?
   
   @xumanbu
   
   We found "jvm_memory_bytes_used nonheap" is not correct, and it is small 
than direct memory.
   When OutOfDirectMemory is throw,"jvm_memory_bytes_used nonheap" is small and 
not correct.
   
   
   
![image](https://github.com/apache/incubator-uniffle/assets/9440617/788a4269-89f3-4395-a9e0-3a24af7e2eba)
   
   
![image](https://github.com/apache/incubator-uniffle/assets/9440617/e18de3ab-00ce-4f5c-9234-061b87ecf7d3)
   
   


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