Add JVM Buffer, JVM GC Metrics

[shreya22-1998]

jvm_buffer_memory_used
jvm_buffer_total_capacity
jvm_buffer_count

jvm_gc_memory_promoted
jvm_gc_memory_allocated
jvm_gc_live_data_size
jvm_gc_max_data_size
jvm_gc_overhead

[Samudraneel24]

Can I have this issue assigned to me? Thanks.

[mateuszrzeszutek]

Hey @Samudraneel24 ,
Buffer pool metrics are already implemented, and there is an open PR for GC metrics: #6362

Sorry for not being up to date with this, but currently there's nothing here for you to work on.

[Samudraneel24]

Oh, I had missed this PR. My main intention was to work on adding more GC metrics using the GC notification events, and looks like this PR already addresses that.

[mateuszrzeszutek]

Both the buffer pool and GC metrics were implemented; closing.