Remove feature flag for fronend Prometheus metrics

Remove feature flag for fronend Prometheus metrics

app/services/ci/prometheus_metrics/observe_histograms_service.rb

@@ -25,8 +25,6 @@ module Ci
       end
 
       def execute
-        return ServiceResponse.success(http_status: :accepted) unless enabled?
-
         params
           .fetch(:histograms, [])
           .each(&method(:observe))
@@ -48,10 +46,6 @@ module Ci
           .fetch(name) { raise ActiveRecord::RecordNotFound }
           .call
       end
-
-      def enabled?
-        ::Feature.enabled?(:ci_accept_frontend_prometheus_metrics, project, default_enabled: :yaml)
-      end
     end
   end
 end

config/feature_flags/development/ci_accept_frontend_prometheus_metrics.yml

----
-name: ci_accept_frontend_prometheus_metrics
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52820
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/300770
-milestone: '13.9'
-type: development
-group: group::pipeline authoring
-default_enabled: false

spec/requests/projects/ci/promeheus_metrics/histograms_controller_spec.rb

@@ -24,20 +24,6 @@ RSpec.describe 'Projects::Ci::PrometheusMetrics::HistogramsController' do
         expect(response).to have_gitlab_http_status(:not_found)
       end
     end
-
-    context 'with the feature flag disabled' do
-      before do
-        stub_feature_flags(ci_accept_frontend_prometheus_metrics: false)
-      end
-
-      it 'returns 202 Accepted' do
-        post histograms_route(histograms: [
-          { name: :pipeline_graph_link_calculation_duration_seconds, value: 1 }
-        ])
-
-        expect(response).to have_gitlab_http_status(:accepted)
-      end
-    end
   end
 
   def histograms_route(params = {})

spec/services/ci/prometheus_metrics/observe_histograms_service_spec.rb

@@ -55,32 +55,6 @@ RSpec.describe Ci::PrometheusMetrics::ObserveHistogramsService do
     end
   end
 
-  context 'with feature flag disabled' do
-    before do
-      stub_feature_flags(ci_accept_frontend_prometheus_metrics: false)
-    end
-
-    let(:params) do
-      {
-        histograms: [
-          { name: 'pipeline_graph_link_calculation_duration_seconds', value: '4' }
-        ]
-      }
-    end
-
-    it 'does not register the metrics' do
-      execute
-
-      expect(histogram_data).to be_nil
-    end
-
-    it 'returns an empty body and status code' do
-      is_expected.to be_success
-      expect(subject.http_status).to eq(:accepted)
-      expect(subject.payload).to eq({})
-    end
-  end
-
   def histogram_data(name = :pipeline_graph_link_calculation_duration_seconds)
     Gitlab::Metrics.registry.get(name)&.get({})
   end