Karmada metrics documentation improvement.

[jwcesign]

What documentation would you like to be added:
Karmada metrics documentation improvement.

Why do you think this document is needed:
Now, the related documents(https://karmada.io/docs/next/reference/instrumentation/metrics/#metrics) is too simple, users don't know:

• Are these metrics in the stable version, will these metrics be deprecated?
• How to query these metrics and what do these metrics look like? Give some demos.
• These metrics should be grouped by components.

referring to:

• https://kubernetes.io/docs/reference/instrumentation/metrics/
• https://kubernetes.io/docs/concepts/cluster-administration/system-metrics/

Where do you think the document should be placed:

https://github.com/karmada-io/website/tree/main/docs/reference/instrumentation/metrics.md

[shivansh-bhatnagar18]

Looks like the issue is still open and needs improvement in the documentation as mentioned in #424. @RainbowMango @jwcesign Can you assign me this issue so that I can start working on this

[RainbowMango]

/assgin @shivansh-bhatnagar18
Just go for it. Thanks.

[RainbowMango]

/assign @shivansh-bhatnagar18

[shivansh-bhatnagar18]

@jwcesign @RainbowMango I have been working on improving the documentation of these metrics and I just wanted to confirm that currently I am able to specify the stability of the metrics as to whether they are STABLE/BETA/ALPHA version. I just wanted to make sure that is there something else that I can do to tell the users whether these metrics will be deprecated or no?

[shivansh-bhatnagar18]

@RainbowMango @jwcesign Also where can I find the stability of these metrics?

[shivansh-bhatnagar18]

Currently the documentation looks like this

[RainbowMango]

@shivansh-bhatnagar18
Actually, all metrics from Karmada no maturity concept. Please ignore that for now. No plan to introduce that yet. You can ignore it.

I updated the issue PR description a little bit for that.

[shivansh-bhatnagar18]

@RainbowMango Thanks for the clarification