pd is causing tikv:8252 error when resource usage hasn't reach limit and io latency increased
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- Go
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Description
## Bug Report
### 1. Minimal reproduce step (Required)
Production system running normal
### 2. What did you expect to see? (Required)
No spike of any issue
### 3. What did you see instead (Required)
At problem time, we see a spike of `tikv:8252 Resource Group Quota Limitation` error:
But the resource group has not exceed resouce limit:
There is issue with PD:
And it appears there is a spike on IO latency:
### 4. What is your TiDB version? (Required)
v7.5.3
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