Shoothzj opened a new pull request, #3252:
URL: https://github.com/apache/bookkeeper/pull/3252

   Fix #2637 #3247
   
   ### Motivation
   The mertics about `jvm_memory_direct_bytes_used` is acquired by netty's 
`PlatformDependent#DIRECT_MEMORY_COUNTER`. Which can only acquired the memory 
used by netty.
   
   ### Changes
   - use `java.nio.Bits#RESERVED_MEMORY` for jvm direct memory metrics.
   - add tests to ensure `jvm_memory_direct_bytes_max` and 
`jvm_memory_direct_bytes_used` gets value.


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