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Enhance the o11y of TiFlash storage layer #10272

@JaySon-Huang

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@JaySon-Huang

Enhancement

The o11y of storage layer memory cost

  • The bytes of overall mem-table for all segments in all physical tables
  • The number of overall segments in all physical tables
  • The bytes of overall DMFile meta in memory

Enhance the scan_details

  • The parsed push_down_executor

Unbalanced read/write panel among all TiFlash instance

  • Write throughput among all TiFlash instances
  • Read throughput among all TiFlash instances
  • SegmentReader CPU among all TiFlash instances

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    affects-7.1This bug affects the 7.1.x(LTS) versions.affects-7.5This bug affects the 7.5.x(LTS) versions.affects-8.1This bug affects the 8.1.x(LTS) versions.affects-8.5This bug affects the 8.5.x(LTS) versions.component/storagetype/enhancementThe issue or PR belongs to an enhancement.

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