[jira] [Created] (IGNITE-6712) Add data volume metrics to data region metrics

[Anton Vinogradov (Jira)]

Alexey Goncharuk created IGNITE-6712:
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             Summary: Add data volume metrics to data region metrics
                 Key: IGNITE-6712
                 URL: https://issues.apache.org/jira/browse/IGNITE-6712
             Project: Ignite
          Issue Type: Bug
      Security Level: Public (Viewable by anyone)
          Components: cache
    Affects Versions: 2.2
            Reporter: Alexey Goncharuk
             Fix For: 2.4


Current DataRegion metrics lack information about how much space is used for data or indexes.
We need to add the following metrics to the DataRegionMetrics interface:
* Total data/index pages
* Physical (loaded) data/index pages
* Evict rate/age for data/index pages

To the Persistence metrics:
* Evict rate/age for data/index pages

To cache metrics:
* Effective space used in data pages (key-value, PK index)
* Effective space used in index pages (secondary indexes)



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