Remove cache_vulnerability_history feature flag

The `gitlab-org` and `gitlab-com` groups have been using the cache for
the vulnerability history endpoint consumed by the group security
dashboard for over 3 months and things have been going well. Time to
take off the training wheels.

ee/app/services/security/store_reports_service.rb

@@ -27,9 +27,9 @@ module Security
     # Silently swallow errors if there are any problems caching vulnerabilities
     def cache_vulnerabilities
       project = @pipeline.project
-      if Feature.enabled?(:cache_vulnerability_history, project.group)
-        Gitlab::Vulnerabilities::HistoryCache.new(project.group, project.id).fetch(Gitlab::Vulnerabilities::History::HISTORY_RANGE, force: true)
-      end
+
+      Gitlab::Vulnerabilities::HistoryCache.new(project.group, project.id)
+        .fetch(Gitlab::Vulnerabilities::History::HISTORY_RANGE, force: true)
     rescue => err
       error("Failed to cache vulnerabilities for pipeline #{@pipeline.id}: #{err}")
     end

ee/changelogs/unreleased/33899-remove-history-cache-ff.yml

+---
+title: Cache vulnerability findings history endpoint for security dashboards
+merge_request: 21349
+author:
+type: added

ee/lib/gitlab/vulnerabilities/history.rb

@@ -15,7 +15,7 @@ module Gitlab
       end
 
       def findings_counter
-        return cached_vulnerability_history if use_vulnerability_cache?
+        return cached_vulnerability_history unless dynamic_filters_included?
 
         findings = vulnerability_findings.count_by_day_and_severity(HISTORY_RANGE)
         ::Vulnerabilities::HistorySerializer.new.represent(findings)
@@ -48,10 +48,6 @@ module Gitlab
         history
       end
 
-      def use_vulnerability_cache?
-        Feature.enabled?(:cache_vulnerability_history, group) && !dynamic_filters_included?
-      end
-
       def dynamic_filters_included?
         dynamic_filters = [:report_type, :confidence, :severity]
         filters.keys.any? { |key| dynamic_filters.include?(key.to_sym) }

ee/spec/lib/gitlab/vulnerabilities/history_spec.rb

@@ -16,30 +16,6 @@ describe Gitlab::Vulnerabilities::History do
   describe '#findings_counter', :use_clean_rails_memory_store_caching do
     subject(:counter) { described_class.new(group, filters).findings_counter }
 
-    context 'feature disabled' do
-      before do
-        stub_feature_flags(cache_vulnerability_history: false)
-      end
-
-      it 'does not call Gitlab::Vulnerabilities::HistoryCache' do
-        expect(Gitlab::Vulnerabilities::HistoryCache).not_to receive(:new)
-
-        counter
-      end
-
-      it 'returns the proper format for the history' do
-        Timecop.freeze do
-          expect(counter[:total]).to eq({ Date.today => 3 })
-          expect(counter[:high]).to eq({ Date.today => 2 })
-        end
-      end
-    end
-
-    context 'feature enabled' do
-      before do
-        stub_feature_flags(cache_vulnerability_history: true)
-      end
-
     context 'filters are passed' do
       let(:filters) { { report_type: :sast } }
 
@@ -79,7 +55,6 @@ describe Gitlab::Vulnerabilities::History do
         end
       end
     end
-    end
 
     def create_vulnerabilities(count, project, options = {})
       report_type = options[:report_type] || :sast

ee/spec/services/security/store_reports_service_spec.rb

@@ -62,23 +62,6 @@ describe Security::StoreReportsService do
         expect { subject }.not_to raise_error
       end
 
-      context 'feature disabled' do
-        before do
-          stub_feature_flags(cache_vulnerability_history: false)
-        end
-
-        it 'does not cache vulnerability history' do
-          expect_any_instance_of(Gitlab::Vulnerabilities::HistoryCache).not_to receive(:fetch)
-
-          subject
-        end
-      end
-
-      context 'feature enabled' do
-        before do
-          stub_feature_flags(cache_vulnerability_history: true)
-        end
-
       it 'caches vulnerability history' do
         expect_any_instance_of(Gitlab::Vulnerabilities::HistoryCache).to receive(:fetch)
 
@@ -86,5 +69,4 @@ describe Security::StoreReportsService do
       end
     end
   end
-  end
 end