Remove opt_in_sidekiq_status feature flag

This was a feature flag for internal purposes, to track a reduction in
Redis usage for background job processing.

Changelog: other

config/feature_flags/development/opt_in_sidekiq_status.yml

----
-name: opt_in_sidekiq_status
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/77349
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/343964
-milestone: '14.7'
-type: development
-group: group::scalability
-default_enabled: false

lib/gitlab/sidekiq_status/client_middleware.rb

@@ -4,13 +4,7 @@ module Gitlab
   module SidekiqStatus
     class ClientMiddleware
       def call(_, job, _, _)
-        status_expiration = job['status_expiration']
-
-        unless ::Feature.enabled?(:opt_in_sidekiq_status, default_enabled: :yaml)
-          status_expiration ||= Gitlab::SidekiqStatus::DEFAULT_EXPIRATION
-        end
-
-        Gitlab::SidekiqStatus.set(job['jid'], status_expiration)
+        Gitlab::SidekiqStatus.set(job['jid'], job['status_expiration'])
 
         yield
       end

spec/lib/gitlab/sidekiq_status/client_middleware_spec.rb

 # frozen_string_literal: true
 
-# This can use fast_spec_helper when the feature flag stubbing is removed.
-require 'spec_helper'
+require 'fast_spec_helper'
 
 RSpec.describe Gitlab::SidekiqStatus::ClientMiddleware, :clean_gitlab_redis_queues do
   describe '#call' do
-    context 'when opt_in_sidekiq_status is disabled' do
-      before do
-        stub_feature_flags(opt_in_sidekiq_status: false)
-      end
-
-      context 'when the job has status_expiration set' do
-        it 'tracks the job in Redis' do
-          expect(Gitlab::SidekiqStatus).to receive(:set).with('123', 1.hour.to_i).and_call_original
-
-          described_class.new
-            .call('Foo', { 'jid' => '123', 'status_expiration' => 1.hour.to_i }, double(:queue), double(:pool)) { nil }
-
-          expect(Gitlab::SidekiqStatus.num_running(['123'])).to eq(1)
-        end
-      end
-
-      context 'when the job does not have status_expiration set' do
-        it 'tracks the job in Redis' do
-          expect(Gitlab::SidekiqStatus).to receive(:set).with('123', 30.minutes.to_i).and_call_original
-
-          described_class.new
-            .call('Foo', { 'jid' => '123' }, double(:queue), double(:pool)) { nil }
+    context 'when the job has status_expiration set' do
+      it 'tracks the job in Redis' do
+        expect(Gitlab::SidekiqStatus).to receive(:set).with('123', 1.hour.to_i)
 
-          expect(Gitlab::SidekiqStatus.num_running(['123'])).to eq(1)
-        end
+        described_class.new
+          .call('Foo', { 'jid' => '123', 'status_expiration' => 1.hour.to_i }, double(:queue), double(:pool)) { nil }
       end
     end
 
-    context 'when opt_in_sidekiq_status is enabled' do
-      before do
-        stub_feature_flags(opt_in_sidekiq_status: true)
-      end
-
-      context 'when the job has status_expiration set' do
-        it 'tracks the job in Redis' do
-          expect(Gitlab::SidekiqStatus).to receive(:set).with('123', 1.hour.to_i).and_call_original
-
-          described_class.new
-            .call('Foo', { 'jid' => '123', 'status_expiration' => 1.hour.to_i }, double(:queue), double(:pool)) { nil }
-
-          expect(Gitlab::SidekiqStatus.num_running(['123'])).to eq(1)
-        end
-      end
-
-      context 'when the job does not have status_expiration set' do
-        it 'does not track the job in Redis' do
-          described_class.new
-            .call('Foo', { 'jid' => '123' }, double(:queue), double(:pool)) { nil }
+    context 'when the job does not have status_expiration set' do
+      it 'does not track the job in Redis' do
+        expect(Gitlab::SidekiqStatus).to receive(:set).with('123', nil)
 
-          expect(Gitlab::SidekiqStatus.num_running(['123'])).to be_zero
-        end
+        described_class.new
+          .call('Foo', { 'jid' => '123' }, double(:queue), double(:pool)) { nil }
       end
     end
   end