Remove feature flag for dropping duplicate jobs

The feature has been enabled for a few days. Let's remove it.

changelogs/unreleased/bvl-remove-sidekiq-deduplication-feature-flag.yml

+---
+title: Avoid scheduling duplicate sidekiq jobs
+merge_request: 29116
+author:
+type: performance

lib/gitlab/sidekiq_middleware/duplicate_jobs.rb

-# frozen_string_literal: true
-
-require 'digest'
-
-module Gitlab
-  module SidekiqMiddleware
-    module DuplicateJobs
-      DROPPABLE_QUEUES = Set.new([
-        Namespaces::RootStatisticsWorker.queue,
-        Namespaces::ScheduleAggregationWorker.queue
-      ]).freeze
-
-      def self.drop_duplicates?(queue_name)
-        Feature.enabled?(:drop_duplicate_sidekiq_jobs) ||
-          drop_duplicates_for_queue?(queue_name)
-      end
-
-      private_class_method def self.drop_duplicates_for_queue?(queue_name)
-        DROPPABLE_QUEUES.include?(queue_name) &&
-          Feature.enabled?(:drop_duplicate_sidekiq_jobs_for_queue)
-      end
-    end
-  end
-end

lib/gitlab/sidekiq_middleware/duplicate_jobs/duplicate_job.rb

@@ -67,7 +67,7 @@ module Gitlab
         end
 
         def droppable?
-          idempotent? && duplicate? && DuplicateJobs.drop_duplicates?(queue_name)
+          idempotent? && duplicate?
         end
 
         private

spec/lib/gitlab/sidekiq_middleware/duplicate_jobs/duplicate_job_spec.rb

@@ -113,28 +113,22 @@ describe Gitlab::SidekiqMiddleware::DuplicateJobs::DuplicateJob, :clean_gitlab_r
   end
 
   describe 'droppable?' do
-    where(:idempotent, :duplicate, :feature_enabled) do
-      # [true, false].repeated_permutation(3)
-      [[true, true, true],
-       [true, true, false],
-       [true, false, true],
-       [true, false, false],
-       [false, true, true],
-       [false, true, false],
-       [false, false, true],
-       [false, false, false]]
+    where(:idempotent, :duplicate) do
+      # [true, false].repeated_permutation(2)
+      [[true, true],
+       [true, false],
+       [false, true],
+       [false, false]]
     end
 
     with_them do
       before do
         allow(AuthorizedProjectsWorker).to receive(:idempotent?).and_return(idempotent)
         allow(duplicate_job).to receive(:duplicate?).and_return(duplicate)
-        allow(Gitlab::SidekiqMiddleware::DuplicateJobs)
-          .to receive(:drop_duplicates?).with(queue).and_return(feature_enabled)
       end
 
       it 'is droppable when all conditions are met' do
-        if idempotent && duplicate && feature_enabled
+        if idempotent && duplicate
           expect(duplicate_job).to be_droppable
         else
           expect(duplicate_job).not_to be_droppable

spec/lib/gitlab/sidekiq_middleware/duplicate_jobs_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe Gitlab::SidekiqMiddleware::DuplicateJobs do
-  using RSpec::Parameterized::TableSyntax
-
-  describe '.drop_duplicates?' do
-    where(:global_feature_enabled, :selected_queue_enabled, :queue, :expected) do
-      true  | true  | described_class::DROPPABLE_QUEUES.first | true
-      true  | true  | "other_queue"                           | true
-      true  | false | described_class::DROPPABLE_QUEUES.first | true
-      true  | false | "other_queue"                           | true
-      false | true  | described_class::DROPPABLE_QUEUES.first | true
-      false | true  | "other_queue"                           | false
-      false | false | described_class::DROPPABLE_QUEUES.first | false
-      false | false | "other_queue"                           | false
-    end
-
-    with_them do
-      before do
-        stub_feature_flags(drop_duplicate_sidekiq_jobs: global_feature_enabled,
-                           drop_duplicate_sidekiq_jobs_for_queue: selected_queue_enabled)
-      end
-
-      it "allows dropping jobs when expected" do
-        expect(described_class.drop_duplicates?(queue)).to be(expected)
-      end
-    end
-  end
-end