clusterpedia APIServer metrics support

[27149chen]

What would you like to be added?

clusterpedia APIServer metrics support:

1. Records the duration of the requests(with: code, handler, method).
2. Records the count of the requests(with: code, handler, method).
3. Records the size of the responses(with: code, handler, method).
4. Records the number requests being handled concurrently at a given time a.k.a inflight requests (with: handler).

FYI: https://github.com/slok/go-http-metrics?tab=readme-ov-file#metrics

Why is this needed?

metrics is improtant for:

1. performance monitoring
2. resource utilization
3. debugging and troubleshooting
4. ...

[clusterpedia-bot]

Hi @27149chen, Thanks for opening an issue! We will look into it as soon as possible.

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