Remove redis_hll_tracking validation from usage_data

lib/gitlab/usage_data.rb

@@ -663,8 +663,6 @@ module Gitlab
       end
 
       def redis_hll_counters
-        return {} unless Feature.enabled?(:redis_hll_tracking, type: :ops, default_enabled: :yaml)
-
         { redis_hll_counters: ::Gitlab::UsageDataCounters::HLLRedisCounter.unique_events_data }
       end
 

spec/lib/gitlab/usage_data_spec.rb

@@ -1402,10 +1402,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
 
     let(:categories) { ::Gitlab::UsageDataCounters::HLLRedisCounter.categories }
 
-    context 'with redis_hll_tracking feature enabled' do
     it 'has all known_events' do
-        stub_feature_flags(redis_hll_tracking: true)
-
       expect(subject).to have_key(:redis_hll_counters)
 
       expect(subject[:redis_hll_counters].keys).to match_array(categories)
@@ -1424,15 +1421,6 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
     end
   end
 
-    context 'with redis_hll_tracking disabled' do
-      it 'does not have redis_hll_tracking key' do
-        stub_feature_flags(redis_hll_tracking: false)
-
-        expect(subject).not_to have_key(:redis_hll_counters)
-      end
-    end
-  end
-
   describe '.aggregated_metrics_data' do
     it 'uses ::Gitlab::Usage::Metrics::Aggregates::Aggregate methods', :aggregate_failures do
       expected_payload = {