Mark zoekt prometheus metric as deprecated

What does this MR do and why?

This MR marks the prometheus metric as deprecated. It is replaced by a gitlab-exporter metric (gitlab-org/ruby/gems/gitlab-exporter!216 (merged))

References

• Zoekt metrics from MetricsUpdateCronWorker are ... (#521933)
• Remove search_zoekt_task_processing_queue_size ... (#525102 - closed)
• Add zoekt probe (gitlab-org/ruby/gems/gitlab-exporter!216 - merged)

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How to set up and validate locally

docs only

MR acceptance checklist

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changed milestone to %17.10

added Deliverable bugperformance devopsfoundations groupglobal search missed-deliverable missed:17.7 missed:17.8 sectioncore platform typebug workflowin review labels

assigned to @terrichu

added documentation label

	1 Message
	This merge request adds or changes documentation files and requires Technical Writing review. The review should happen before merge, but can be post-merge if the merge request is time sensitive.

Documentation review

The following files require a review from a technical writer:

• doc/administration/monitoring/prometheus/gitlab_metrics.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
• Documentation workflows for information on when to assign a merge request for review.

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mentioned in issue #525102 (closed)

removed missed:17.7 label

removed missed-deliverable label

removed missed:17.8 label

changed the description

marked this merge request as ready

I used the wrong issue name in the branch so the labels got brought across wrong

added typemaintenance label and removed typebug label

removed Deliverable label

removed bugperformance label

@ashrafkhamis would you mind a documentation review? I'm marking this metric as deprecated, it will be removed in %18.0 and I have linked the issue for that

requested review from @ashrafkhamis

added docs-only label