# Monitoring Analysis (B)

+ Grafana monitoring`TiKV Details --> Raft IO`
  + Apply delays are generally smooth


![left](./student-guide/diagram/03-21-1.png)

  + Append delay is generally stable


![left](./student-guide/diagram/03-21-2.png)

  + Commit log duration increased significantly


![left](./student-guide/diagram/03-21-3.png)

------------------------------------------------------------
Raft IO: Latency for each TiKV Raft persistent log (append log) and commit log to state machine (apply log) is generally stable, but the latency for one TiKV to replica logs to most replicas (commit log) has increased significantly, and is similar to the upward trend of gRPC Duration.