[jira] [Created] (IGNITE-14774) Add metrics for index pages loaded into memory

["Aleksandr Polovtcev (Jira)" <ji...@apache.org>]

Aleksandr Polovtcev created IGNITE-14774:
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             Summary: Add metrics for index pages loaded into memory
                 Key: IGNITE-14774
                 URL: https://issues.apache.org/jira/browse/IGNITE-14774
             Project: Ignite
          Issue Type: Improvement
          Components: general
    Affects Versions: 2.11
            Reporter: Aleksandr Polovtcev
            Assignee: Aleksandr Polovtcev
             Fix For: 2.11


Expose the number of index pages currently loaded into memory on per-cache group and per-data region basis.
h3. Implementation details
 # PageMetrics - an aggregation of all page-related metrics. At the moment of writing, contains the total number of pages and the number of index pages.
 # DataRegionMetricsImpl now contains page metrics related to every created cache group in a form of an immutable copy-on-write IntMap. It also contains an aggregation over these metrics that can be used as metrics for the whole data region.
 # Index pages allocation is tracked through the PageIO#initNewPage method, which can later be used to track other kinds of pages.
 # Index pages de-allocation is tracked in various places like replacing a page or adding it to a free list as I couldn’t find a single suitable place for this logic.



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