Denis Magda commented on IGNITE-8305:

Make sure to explain how to calculate the following:
* Current Node size - the total size of data on a node in MB/GB
* Current Cache size - the data size in a cache in MB/GB

Here is a right answer:
# Total cluster size is the sum of 
DataStorageMetricsMXBean#getTotalAllocatedSize for all nodes
# Current node size is DataStorageMetricsMXBean#getTotalAllocatedSize
# Current cache size is the sum of 
CacheGroupMetricsMXBean#getTotalAllocatedSize for all nodes (note that metric 
is available per cache-group)
# Current node cache size is CacheGroupMetricsMXBean#getTotalAllocatedSize 
(same note as above)

> Update metrics page with new storage and memory related metics
> --------------------------------------------------------------
>                 Key: IGNITE-8305
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8305
>             Project: Ignite
>          Issue Type: Task
>          Components: documentation
>            Reporter: Denis Magda
>            Assignee: Prachi Garg
>            Priority: Major
>             Fix For: 2.5
> The new metrics are added by the endeavor: 
> https://issues.apache.org/jira/browse/IGNITE-8078

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