tongjian

Observer: add some metrics for the waiting queue of snapshot generator.

2

### What is changed and how it works? Issue Number: Close #12945 What's Changed: ```commit-message ``` ### Related changes ### Check List Tests - Manual test (add detailed scripts or...

resource_control: add active resource group count in response

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### What is changed and how it works? Issue Number: Close #xxx What's Changed: ```commit-message ``` ### Related changes - [ ] PR to update `pingcap/docs`/`pingcap/docs-cn`: - [ ] Need...

When TiDB receives a query request, it forwards the request to the underlying TiKV for data retrieval and processing. Currently, TiDB does not have a built-in request caching mechanism, and...

metrics: add running metrics for grpc

3

close: #640 the metrics after this pr 

In some time, it's very difficult to know the affect that the grpc pool brings. In my test, the loads in different complement queue maybe different and every grpc pool...

simulator: scale-in and scale out test for `store-limit-version=v2`

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### What problem does this PR solve? Issue Number: Close #xxx ### What is changed and how does it work? ```commit-message run tiup playground nightly --host localhost --kv.binpath ./bin/pd-simulator --kv=1...

Reduce the cpu usage of the `snapshot-worker` thread to prevent it from blocking scheduling.

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## Development Task The Snapshot-worker is primarily responsible for applying snapshots, destroying peers, and forwarding snapshot-generate messages. The deletion of peers can consume a significant amount of CPU, resulting in...