[jira] [Created] (PHOENIX-7992) Add server-side replay performance metrics for HA sync replication

["Himanshu Gwalani (Jira)" <ji...@apache.org>]

Himanshu Gwalani created PHOENIX-7992:
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             Summary: Add server-side replay performance metrics for HA sync replication
                 Key: PHOENIX-7992
                 URL: https://issues.apache.org/jira/browse/PHOENIX-7992
             Project: Phoenix
          Issue Type: Sub-task
            Reporter: Himanshu Gwalani
            Assignee: Himanshu Gwalani


The replay/forward round-eligibility gate is evaluated on the wall clock, but PHOENIX-7813 aligned the scheduler wake — fired on the monotonic clock (System.nanoTime) — to that boundary with zero margin. Small nanoTime-vs-wall-clock drift can tip a wake just below the boundary, so the round is not yet eligible and the region server loses a full (~60s) cycle. Most damaging during planned failover.
  
Fix (shared base class ReplicationLogDiscovery, inherited by replay + forwarder):
  1. Epsilon margin so the aligned wake lands just after the boundary rather than exactly on it
     (config phoenix.replication.discovery.aligned.delay.epsilon.millis, default 500ms).
  2. Re-anchor to the wall-clock grid every cycle (self-rescheduling one-shot instead of
     scheduleAtFixedRate) so alignment error cannot accumulate.



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