# Monitoring Analysis (A)

+ Grafana Monitoring TiKV Details —>`gRPC --> 99% gRPC message duration`
  + The kv_prewrite delay rose significantly around 9:25


![left](./student-guide/diagram/03-18-1.png)

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Grafana monitors TiKV Details —> gRPC —> 99% gRPC message duration is most commonly used to determine if the issue is in TiKV 

Grafana monitors TiKV Details —> gRPC —> 99% gRPC message duration: Writes involve 2-phase commit, and the kv_prewrite delay increases significantly from around 9:25, up to 600ms+