Deprecate Sidekiq min-concurrency and max-concurrency

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Deprecation Summary

Deprecate the --max-concurrency and --min-concurrency options to run Sidekiq cluster CLI.

The options will be removed in %17.0 and will be replaced with a simpler, single-value concurrency option.

More information: gitlab-com/gl-infra/scalability#2760

Breaking Change

Omnibus installations would have to:

• remove sidekiq['min_concurrency'] and sidekiq['max_concurrency']
• add sidekiq['concurrency']

Affected Topology

Self-managed users

Affected Tier

• Free
• Premium
• Ultimate

Checklists

Labels

• This issue is labeled deprecation, and with the relevant ~devops::, ~group::, and ~Category: labels.
• This issue is labeled breaking change if the removal of the deprecated item will be a breaking change.

Timeline

Please add links to the relevant merge requests.

• As soon as possible, but no later than the third milestone preceding the major release (for example, given the following release schedule: 14.8, 14.9, 14.10, 15.0 – 14.8 is the third milestone preceding the major release):
  • A deprecation announcement entry has been created so the deprecation will appear in release posts and on the general deprecation page. MR: !143182 (merged)
  • Documentation has been updated to mark the feature as deprecated.
• On or before the major milestone: A removal entry has been created so the removal will appear on the removals by milestones page and be announced in the release post. !143182 (merged)
• On the major milestone:
  • The deprecated item has been removed. omnibus-gitlab!7549 (merged)
  • If the removal of the deprecated item is a breaking change, the merge request is labeled breaking change.

Mentions

• Your stage's stable counterparts have been @mentioned on this issue. For example, Customer Support, Customer Success (Technical Account Manager), Product Marketing Manager.
  • To see who the stable counterparts are for a product team visit product categories
    • If there is no stable counterpart listed for Sales/CS please mention @timtams
    • If there is no stable counterpart listed for Support please mention @gitlab-com/support/managers
    • If there is no stable counterpart listed for Marketing please mention @cfoster3
• Your GPM has been @mentioned so that they are aware of planned deprecations. The goal is to have reviews happen at least two releases before the final removal of the feature or introduction of a breaking change.

Deprecation Milestone

%16.9

Planned Removal Milestone

%17.0

Links