[jira] [Created] (IGNITE-29098) Add PersistenceEnabled metric to expose data region type

["Ilya Shishkov (Jira)" <ji...@apache.org>]

Ilya Shishkov created IGNITE-29098:
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             Summary: Add PersistenceEnabled metric to expose data region type
                 Key: IGNITE-29098
                 URL: https://issues.apache.org/jira/browse/IGNITE-29098
             Project: Ignite
          Issue Type: Task
            Reporter: Ilya Shishkov
             Fix For: 2.19


h2. Description

Currently there is no way to determine whether a data region is persistent or in-memory from its metrics. This ticket adds a boolean metric {{PersistenceEnabled}} to each data region, published in the {{io.dataregion.<name>}} registry and exposed via JMX, the read API, and the legacy {{DataRegionMetrics}} interface. It returns {{true}} for persistent regions and {{false}} for in-memory regions, determined once at startup. The fix also adds {{DataRegionMetrics.isPersistenceEnabled()}} implemented in {{DataRegionMetricsImpl}} and {{{}DataRegionMetricsSnapshot{}}}, without changing exporters, configuration classes, or the persistence engine.
h2. Acceptance Criteria
 * Every data region exposes the {{PersistenceEnabled}} metric after node startup.
 * Value is {{true}} for persistent regions and {{false}} for in-memory regions.
 * Value always matches the region's persistence configuration.
 * Metric is visible in standard monitoring (e.g., JMX) alongside other data region metrics.
 * Existing data region metrics behave unchanged.



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