[jira] [Created] (HBASE-30025) Add metrics for cache admission decisions and tiered block cache topology (per-tier stats and promotion/demotion)

[Vladimir Rodionov (Jira)]

Vladimir Rodionov created HBASE-30025:
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             Summary: Add metrics for cache admission decisions and tiered 
block cache topology (per-tier stats and promotion/demotion)
                 Key: HBASE-30025
                 URL: https://issues.apache.org/jira/browse/HBASE-30025
             Project: HBase
          Issue Type: New Feature
            Reporter: Vladimir Rodionov
            Assignee: Vladimir Rodionov


Add metrics for:
        •       admission decisions (accepted/rejected)
        •       rejection reasons
        •       promotion/demotion counts
        •       per-tier usage and hit ratios

Expose via existing HBase metrics/JMX.



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