BufferAllocatorMetric (Netty5/Buffer 5.0.0.Alpha5 API)

```
public interface BufferAllocatorMetric
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`List<PoolArenaMetric>`	`arenaMetrics()`	Return a `List` of all `PoolArenaMetric`s that are provided by this pool.
`int`	`chunkSize()`	Return the chunk size for an arena.
`int`	`normalCacheSize()`	Return the size of the normal cache.
`int`	`numArenas()`	Return the number of arenas.
`int`	`numThreadLocalCaches()`	Return the number of thread local caches used by this `PooledBufferAllocator`.
`long`	`pinnedMemory()`	Returns the number of bytes of memory that is currently pinned to the buffers allocated by a `BufferAllocator`, or `-1` if unknown.
`int`	`smallCacheSize()`	Return the size of the small cache.
`long`	`usedMemory()`	Returns the number of bytes of heap memory used by a `BufferAllocator` or `-1` if unknown.

- Method Detail
  - numArenas
```
int numArenas()
```
    Return the number of arenas.
  - arenaMetrics
```
List<PoolArenaMetric> arenaMetrics()
```
    Return a List of all PoolArenaMetrics that are provided by this pool.
  - numThreadLocalCaches
```
int numThreadLocalCaches()
```
    Return the number of thread local caches used by this PooledBufferAllocator.
  - smallCacheSize
```
int smallCacheSize()
```
    Return the size of the small cache.
  - normalCacheSize
```
int normalCacheSize()
```
    Return the size of the normal cache.
  - chunkSize
```
int chunkSize()
```
    Return the chunk size for an arena.
  - usedMemory
```
long usedMemory()
```
    Returns the number of bytes of heap memory used by a BufferAllocator or -1 if unknown.
  - pinnedMemory
```
long pinnedMemory()
```
    Returns the number of bytes of memory that is currently pinned to the buffers allocated by a BufferAllocator, or -1 if unknown.