Update HA docs with new node counts & CPU guidance
What does this MR do?
This MR updates the Reference Architectures on the Scaling and High Availability page with some new Rails node counts and added guidance on the CPU specs used as well as calling out that nodes may need to be adjusted depending on the hardware customers use.
Related issues
Closes gitlab-org/quality/performance#186 (closed)
Author's checklist
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Follow the Documentation Guidelines and Style Guide. -
Link docs to and from the higher-level index page, plus other related docs where helpful. -
Apply the documentation label.
Review checklist
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1. Primary Reviewer
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Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.
2. Technical Writer
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3. Maintainer
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Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review. -
Ensure a release milestone is set. -
If there has not been a technical writer review, create an issue for one using the Doc Review template.
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