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- title: "Queue selector for running Sidekiq is deprecated" # (required) Clearly explain the change, or planned change. For example, "The `confidential` field for a `Note` is deprecated" or "CI/CD job names will be limited to 250 characters."
announcement_milestone: "15.9" # (required) The milestone when this feature was first announced as deprecated.
removal_milestone: "17.0" # (required) The milestone when this feature is planned to be removed
end_of_support_milestone: "16.0"
breaking_change: true # (required) Change to false if this is not a breaking change.
reporter: marcogreg # (required) GitLab username of the person reporting the change
stage: scalability # (required) String value of the stage that the feature was created in. e.g., Growth
issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/390787 # (required) Link to the deprecation issue in GitLab
body: | # (required) Do not modify this line, instead modify the lines below.
Running Sidekiq with a [queue selector](https://docs.gitlab.com/ee/administration/sidekiq/processing_specific_job_classes.html#queue-selectors) (having multiple processes listening to a set of queues) and [negate settings](https://docs.gitlab.com/ee/administration/sidekiq/processing_specific_job_classes.html#negate-settings) is deprecated and will be fully removed in 17.0.
You can migrate away from queue selectors to [listening to all queues in all processes](https://docs.gitlab.com/ee/administration/sidekiq/extra_sidekiq_processes.html#start-multiple-processes). For example, if Sidekiq is currently running with 4 processes (denoted by 4 elements in `sidekiq['queue_groups']` in `/etc/gitlab/gitlab.rb`) with queue selector (`sidekiq['queue_selector'] = true`), you can change Sidekiq to listen to all queues in all 4 processes,for example `sidekiq['queue_groups'] = ['*'] * 4`. This approach is also recommended in our [Reference Architecture](https://docs.gitlab.com/ee/administration/reference_architectures/5k_users.html#configure-sidekiq). Note that Sidekiq can effectively run as many processes as the number of CPUs in the machine.
While the above approach is recommended for most instances, Sidekiq can also be run using [routing rules](https://docs.gitlab.com/ee/administration/sidekiq/processing_specific_job_classes.html#routing-rules) which is also being used on GitLab.com. You can follow the [migration guide from queue selectors to routing rules](https://docs.gitlab.com/ee/administration/sidekiq/processing_specific_job_classes.html#migrating-from-queue-selectors-to-routing-rules). You need to take care with the migration to avoid losing jobs entirely.
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