[jira] [Assigned] (IGNITE-27688) Implement getPagesFillFactor metric

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

     [ https://issues.apache.org/jira/browse/IGNITE-27688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksandr Polovtsev reassigned IGNITE-27688:
--------------------------------------------

    Assignee: Aleksandr Polovtsev

> Implement getPagesFillFactor metric
> -----------------------------------
>
>                 Key: IGNITE-27688
>                 URL: https://issues.apache.org/jira/browse/IGNITE-27688
>             Project: Ignite
>          Issue Type: Improvement
>          Components: storage engines ai3
>            Reporter: Vladimir Pligin
>            Assignee: Aleksandr Polovtsev
>            Priority: Major
>              Labels: ignite-3
>
> h3. Background
> In Apache Ignite 2, the {{getPagesFillFactor()}} method in {{DataRegionMetrics}} provided a critical metric for monitoring memory efficiency. This metric is missing in Apache Ignite 3 and needs to be implemented to maintain feature parity and provide users with essential memory monitoring capabilities.
> The page fill factor represents the *ratio of space occupied by user and system data to the total size of all allocated pages* that contain this data. It is expressed as a value between 0.0 and 1.0.
> h3. Purpose and Use Cases
> This metric helps determine:
>  # *Memory Efficiency* - How much of the allocated page memory is actually being used for storing data versus being wasted as empty space within pages.
>  # *Fragmentation Detection* - A low fill factor indicates that data pages are fragmented, meaning there is significant empty space distributed across pages that cannot be reclaimed.
>  # *Capacity Planning* - Used to estimate actual data size.
>  # *Performance Tuning (and memory utilization)* - Low fill factor may indicate the need for page size adjustment



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