# Expected Diagnosis: tikv-node-slowdown-during-incident-window

This case should conclude that the observed query slowdown is best explained by
a single-TiKV flow control / backpressure path on `db-tikv-9`, not by generic
CPU explanations or a pending-compaction-only story.

The expected answer should make these points explicit:

- the slowdown is scoped to `db-tikv-9`
- flow control / backpressure is the strongest current driver or hypothesis
- pending compaction, if mentioned, is not the final root cause
- remediation should target the flow-control / backpressure path, such as
  admission control, throttling, or other relevant TiKV-side follow-up

What should fail this case:

- stopping at flow control alone as the final root cause
- giving a generic CPU explanation without a TiKV-side flow-control / backpressure path
- mixing cluster-wide and single-node scope in the conclusion