[PR] [FLINK-40211][checkpoint] Add Regional Checkpoint metrics, REST API and Web UI support [flink]

["raoraoxiong (via GitHub)" <gi...@apache.org>]

raoraoxiong opened a new pull request, #28965:
URL: https://github.com/apache/flink/pull/28965

   ## Purpose
   
   Adds observability for Regional Checkpoint (FLIP-600 Phase 7-9): metrics, REST API fields, and Web UI display.
   
   ## Changes
   
   **Commit 1: Metrics and REST API**
   - Rename metric to `regional_checkpoint_count` (snake_case) and change from Gauge to Counter
   - Add `ref_checkpoint_id` to CompletedSubtaskCheckpointStatistics
   - Add `oldest_ref_checkpoint_id` to TaskCheckpointStatistics and CheckpointStatistics (cross-subtask/task min aggregation)
   - Add `regional_checkpoint_enabled`, `regional_max_failure_ratio`, `regional_max_consecutive_failures` to CheckpointConfigInfo
   - Wire data channel: OperatorSubtaskState.refCheckpointId → SubtaskStateStats → TaskStateStats → CheckpointStatistics
   - Regenerate REST API snapshot
   
   **Commit 2: Web UI**
   - Display Regional Checkpoint configuration in checkpoint config page
   - Display `ref_checkpoint_id` per subtask in checkpoint detail page
   - Add `oldest_ref_checkpoint_id` column in checkpoint statistics
   
   ## Testing
   - Unit tests: metric counter, REST API field round-trip, cross-subtask/task min aggregation
   - REST API stability test passes with regenerated snapshot
   
   ## Dependencies
   - Depends on PR #2 (FLINK-40209): Regional Checkpoint core mechanism (refCheckpointId infrastructure)
   
   Generated-by: CodeBuddy Code (GLM-5.2)


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Re: [PR] [FLINK-40211][checkpoint] Add Regional Checkpoint metrics, REST API and Web UI support [flink]

["flinkbot (via GitHub)" <gi...@apache.org>]

flinkbot commented on PR #28965:
URL: https://github.com/apache/flink/pull/28965#issuecomment-5278544049

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   ## CI report:
   
   * 95c188f81188f5d52b41be82fb8b595fbcb8ad7f UNKNOWN
   
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