featzhang commented on PR #27771:
URL: https://github.com/apache/flink/pull/27771#issuecomment-4062587654

   Closing this PR due to fundamental architectural issues found during CI 
analysis.
   
   **Issues Identified:**
   1. Access to private members (MetricStore.JobMetricStore, 
TaskMetricStore.subtasks)
   2. Non-existent API (JobMetricStoreSnapshot.get())
   3. Incorrect interface usage (MessageHeaders instead of 
RuntimeMessageHeaders)
   4. Wrong class references (HttpMethod instead of HttpMethodWrapper)
   5. Incorrect Handler inheritance structure
   
   **Root Cause:**
   The implementation does not follow the standard Flink REST API architecture 
pattern. A complete redesign is required.
   
   **Next Steps:**
   - Research existing metrics handler implementations (e.g., 
JobManagerOperatorMetricsHandler)
   - Redesign the architecture following Flink standards
   - Reimplement with proper interfaces and access patterns


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