Remove unused metrics environment helpers

The Metrics Dashboard (used for monitoring apps deploying using gitlab)
was deprecated in 14.7 and removed from the product in 16.0.
This commit cleans up a portion of the dead code.

https://gitlab.com/groups/gitlab-org/-/epics/10107

app/helpers/environments_helper.rb

@@ -19,69 +19,9 @@ def environments_folder_list_view_data(project, folder)
     }
   end
 
-  def custom_metrics_available?(project)
-    can?(current_user, :admin_project, project)
-  end
-
-  def metrics_data(project, environment)
-    return {} if Feature.enabled?(:remove_monitor_metrics)
-
-    metrics_data = {}
-    metrics_data.merge!(project_metrics_data(project)) if project
-    metrics_data.merge!(environment_metrics_data(environment)) if environment
-    metrics_data.merge!(project_and_environment_metrics_data(project, environment)) if project && environment
-    metrics_data.merge!(static_metrics_data)
-
-    metrics_data
-  end
-
   def can_destroy_environment?(environment)
     can?(current_user, :destroy_environment, environment)
   end
-
-  private
-
-  def project_metrics_data(project)
-    return {} unless project
-
-    {
-      'settings_path' => edit_project_settings_integration_path(project, 'prometheus'),
-      'clusters_path' => project_clusters_path(project),
-      'default_branch' => project.default_branch,
-      'project_path' => project_path(project),
-      'tags_path' => project_tags_path(project),
-      'custom_metrics_path' => project_prometheus_metrics_path(project),
-      'validate_query_path' => validate_query_project_prometheus_metrics_path(project),
-      'custom_metrics_available' => custom_metrics_available?(project).to_s
-    }
-  end
-
-  def environment_metrics_data(environment)
-    return {} unless environment
-
-    {
-      'current_environment_name' => environment.name,
-      'has_metrics' => environment.has_metrics?.to_s,
-      'environment_state' => environment.state.to_s
-    }
-  end
-
-  def project_and_environment_metrics_data(project, environment)
-    return {} unless project && environment
-
-    {
-      'deployments_endpoint' => project_environment_deployments_path(project, environment, format: :json),
-      'operations_settings_path' => project_settings_operations_path(project),
-      'can_access_operations_settings' => can?(current_user, :admin_operations, project).to_s
-    }
-  end
-
-  def static_metrics_data
-    {
-      'documentation_path' => help_page_path('administration/monitoring/prometheus/index'),
-      'add_dashboard_documentation_path' => help_page_path('operations/metrics/dashboards/index', anchor: 'add-a-new-dashboard-to-your-project')
-    }
-  end
 end
 
 EnvironmentsHelper.prepend_mod_with('EnvironmentsHelper')

spec/helpers/environments_helper_spec.rb

@@ -10,91 +10,6 @@
   let_it_be(:project, reload: true) { create(:project, :repository) }
   let_it_be(:environment) { create(:environment, :with_folders, folder: folder_name, project: project) }
 
-  describe '#metrics_data', feature_category: :metrics do
-    before do
-      stub_feature_flags(remove_monitor_metrics: false)
-
-      # This is so that this spec also passes in EE.
-      allow(helper).to receive(:current_user).and_return(user)
-      allow(helper).to receive(:can?).and_return(true)
-    end
-
-    let(:metrics_data) { helper.metrics_data(project, environment) }
-
-    it 'returns data' do
-      expect(metrics_data).to include(
-        'settings_path' => edit_project_settings_integration_path(project, 'prometheus'),
-        'clusters_path' => project_clusters_path(project),
-        'current_environment_name' => environment.name,
-        'documentation_path' => help_page_path('administration/monitoring/prometheus/index'),
-        'add_dashboard_documentation_path' => help_page_path('operations/metrics/dashboards/index', anchor: 'add-a-new-dashboard-to-your-project'),
-        'deployments_endpoint' => project_environment_deployments_path(project, environment, format: :json),
-        'default_branch' => 'master',
-        'project_path' => project_path(project),
-        'tags_path' => project_tags_path(project),
-        'has_metrics' => environment.has_metrics?.to_s,
-        'environment_state' => environment.state,
-        'custom_metrics_path' => project_prometheus_metrics_path(project),
-        'validate_query_path' => validate_query_project_prometheus_metrics_path(project),
-        'custom_metrics_available' => 'true',
-        'operations_settings_path' => project_settings_operations_path(project),
-        'can_access_operations_settings' => 'true'
-      )
-    end
-
-    context 'without admin_operations permission' do
-      before do
-        allow(helper).to receive(:can?)
-          .with(user, :admin_operations, project)
-          .and_return(false)
-      end
-
-      specify do
-        expect(metrics_data).to include(
-          'can_access_operations_settings' => 'false'
-        )
-      end
-    end
-
-    context 'when the environment is not available' do
-      before do
-        environment.stop
-      end
-
-      subject { metrics_data }
-
-      it { is_expected.to include('environment_state' => 'stopped') }
-    end
-
-    context 'when metrics dashboard feature is unavailable' do
-      before do
-        stub_feature_flags(remove_monitor_metrics: true)
-      end
-
-      it 'does not return data' do
-        expect(metrics_data).to be_empty
-      end
-    end
-  end
-
-  describe '#custom_metrics_available?', feature_category: :metrics do
-    subject { helper.custom_metrics_available?(project) }
-
-    before do
-      project.add_maintainer(user)
-
-      allow(helper).to receive(:current_user).and_return(user)
-
-      allow(helper).to receive(:can?)
-        .with(user, :admin_project, project)
-        .and_return(true)
-    end
-
-    it 'returns true' do
-      expect(subject).to eq(true)
-    end
-  end
-
   describe '#environments_folder_list_view_data' do
     subject { helper.environments_folder_list_view_data(project, folder_name) }