schema_version: 1
id: tail-latency-surge-during-incident-window
title: Tail latency surge investigation
status: active
owner: claude-code
environment:
  profile: stable-premium
  cluster_id: '10805087899823024166'
  parent_id: '2028998946604449792'
  cluster_type: premium
  tidb_version: v8.5.4
time_window:
  incident_at: '2026-03-09T04:14:00Z'
  allowed:
  - id: workspace_observed_window
    start: '2026-03-09T04:14:00Z'
    end: '2026-03-09T05:14:00Z'
prompt:
  text: 请帮我分析集群 10805087899823024166 在 2026-03-09T04:14:00Z 到 2026-03-09T05:14:00Z 这个时间窗内的尾延迟异常升高现象。业务侧反馈在该时段出现明显超时，TiDB P999 延迟最高接近 30 秒。请判断最可能的根因，并给出关键证据链、影响判断和处理建议。
tags:
- high-latency
- tail-latency
- transactional-workload
case_tier: P0
cost_tier: low
followup:
  scheduled_max_followups: 0
execution:
  acp_bash_timeout_s: 300