Add metrics for paused indexing Sidekiq queue size

What does this MR do?

Issue #217918 (closed)

• Add a new Prometheus metric for the index paused Sidekiq queue size. Following the example set by the existing metrics.
• Updated documentation
• Updated unit test

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team

changed milestone to %13.2

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assigned to @terrichu

added 1 commit

• e77b2e0c - Add Prometheus Metrics for Index Pause Sidekiq Queue

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	1 Message
	This merge request adds or changes files that require a review from the Technical Writing team.

Documentation review

The following files require a review from a technical writer:

• doc/administration/monitoring/prometheus/gitlab_metrics.md

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

• Technical Writers assignments for the appropriate technical writer for this review.
• Documentation workflows for information on when to assign a merge request for review.

Reviewer roulette

Changes that require review have been detected! A merge request is normally reviewed by both a reviewer and a maintainer in its primary category (e.g. frontend or backend), and by a maintainer in all other categories.

To spread load more evenly across eligible reviewers, Danger has picked a candidate for each review slot, based on their timezone. Feel free to override these selections if you think someone else would be better-suited, or the chosen person is unavailable.

To read more on how to use the reviewer roulette, please take a look at the Engineering workflow and code review guidelines. Please consider assigning a reviewer or maintainer who is a domain expert in the area of the merge request.

Once you've decided who will review this merge request, mention them as you normally would! Danger does not automatically notify them for you.

Category	Reviewer	Maintainer
backend	Rubén Dávila (@rdavila) (UTC-5, 1 hours behind @terrichu)	Mayra Cabrera (@mayra-cabrera) (UTC-5, 1 hours behind @terrichu)

If needed, you can retry the danger-review job that generated this comment.

Generated by Danger

marked the checklist item Changelog entry as completed

changed the description

added documentation label

added 1 commit

• 3a2ec721 - fixup! Add Prometheus Metrics for Index Pause Sidekiq Queue

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changed title from WIP: Resolve "Follow-up from "Implement a switch to pause all of the write requests to elasticsearch"" to WIP: Add metrics for paused indexing Sidekiq queue size

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• 3a2ec721...8dd8e6ad - 16 commits from branch master
• 028970d5 - Add Prometheus Metrics for Index Pause Sidekiq Queue
• 64f9ab20 - fixup! Add Prometheus Metrics for Index Pause Sidekiq Queue

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marked the checklist item Style guides as completed

marked the checklist item Merge request performance guidelines as completed

marked the checklist item Code review guidelines as completed

added 1 commit

• bd79433c - Add Prometheus Metrics for Index Pause Sidekiq Queue

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unmarked as a Work In Progress

marked the checklist item Documentation (if required) as completed

assigned to @axil and @mbergeron

@mbergeron are you available for a first review?

@axil I think this requires a documentation review as well, it's a small change but I wanted to be sure.

added workflowin review label and removed workflowin dev label

mentioned in commit gitlab-com/runbooks@589185d5

mentioned in merge request gitlab-com/runbooks!2476 (merged)

approved this merge request

@terrichu I'm glad you decided to do this, as I remember you talking about that just yesterday, so props to Results here.

I only have a single comment on the naming, feel free to apply it or not.

I approve this change.

unassigned @mbergeron

approved this merge request

unassigned @axil

added Technical Writing label

resolved all threads

added 1 commit

• 2ca03b10 - fixup! Add Prometheus Metrics for Index Pause Sidekiq Queue

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marked as a Work In Progress from 2ca03b10

assigned to @mayra-cabrera

@mayra-cabrera are you available for a back end maintainer review?

mentioned in commit gitlab-com/runbooks@8595a2b0

unmarked as a Work In Progress

approved this merge request

enabled an automatic merge when the pipeline for f9236a3e succeeds

Thanks @terrichu! This LGTM, MWPS set

merged

mentioned in commit fd57cd63

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mentioned in commit 9ab08d67

mentioned in merge request !36395 (merged)

mentioned in merge request !36473 (merged)

mentioned in commit gitlab-com/runbooks@9dcf3893

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