Description
With new 2.0 architecture, many caches can share one memory policy. Memory metrics allows to measure memory usage (loaded pages) for the whole policy. However, there's also a need to measure how much memory (or pages) is used by each cache.
Before 2.0 such information was accessible with CacheMetrics#getOffHeapAllocatedSize, but current implemetation returns 0.
We should either implement it or provide alternative metrics (e. g. approximate number of loaded pages per cache). Please note that if persistence is disabled, precise number of loaded pages per cache is not defined - one page can contain entries of different caches.
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IGNITE-5461 Visor shows wrong statistics for off heap memory
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