the metric doc lacks updates

[bysph]

This document belongs to kube-batch instead of Volcano, and the metric names inside cannot be matched.

https://github.com/volcano-sh/volcano/blob/master/docs/design/metrics.md

[Monokaix]

/good-first-issue

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[fengruotj]

@Monokaix. Hi, I can update the metrics doc, please asign it to me~~ /assign @fengruotj

[Monokaix]

/assign @fengruotj

[Monokaix]

Assigned, you can also comment /assign to assign yourself.

[fengruotj]

Hi, I've already fixed it here: https://github.com/volcano-sh/volcano/pull/3782

[stale[bot]]

Hello 👋 Looks like there was no activity on this issue for last 90 days. Do you mind updating us on the status? Is this still reproducible or needed? If yes, just comment on this PR or push a commit. Thanks! 🤗 If there will be no activity for 60 days, this issue will be closed (we can always reopen an issue if we need!).