Added note to the deploy.md (on all versions) to make people aware th…

[HemeraOne]

…at only a single metric server can handle external.metrics.k8s.io per cluster

Provide a description of what has been changed

Checklist

• Commits are signed with Developer Certificate of Origin (DCO)

Fixes #

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[tomkerkhove]

Hi, this is already documented in the FAQ

[JorTurFer]

FAQ is not totally visible. I think that we can merge the note as users usually don't check the FAQ until something is not working, but they will see the note before installing

[tomkerkhove]

If we merge it, then we have 2 places to maintain IMO. We should fix FAQ discoverability instead or change the note to just check FAQ to learn more about metric server limitations

[JorTurFer]

The problems with FAQ is that it doesn't allow linking it. I mean, this note could be just something like:

NOTE: Check api server limitations here: FAQ_SECTION_LINK

But we can't link those items, that's why I'd merge this, at least until we improve the faq

[tomkerkhove]

Well, we can just fix that @JorTurFer 🤷‍♂️

Every item has an achor assigned and can be linked to: https://keda.sh/docs/faq/#can-i-run-multiple-metric-servers-serving-external-metrics-in-the-same-cluster. Please update the docs to just point to this instead please.

I have opened #1273 to do the same for the categories and #1274 to provide a button to copy.

[JorTurFer]

is there any option to open the linked anchor?
Default behaviour is browsing to it closed and that's a bit confusing: