Change condition to display Metrics tab in sidebar

Display the metrics tab in the sidebar when the user has the
metrics_dashboard permission.

app/helpers/projects_helper.rb

@@ -410,7 +410,7 @@ module ProjectsHelper
       nav_tabs << :pipelines
     end
 
-    if can?(current_user, :read_environment, project) || can?(current_user, :read_cluster, project)
+    if can_view_operations_tab?(current_user, project)
       nav_tabs << :operations
     end
 
@@ -439,6 +439,7 @@ module ProjectsHelper
   def tab_ability_map
     {
       environments:       :read_environment,
+      metrics_dashboards: :metrics_dashboard,
       milestones:         :read_milestone,
       snippets:           :read_snippet,
       settings:           :admin_project,
@@ -454,6 +455,12 @@ module ProjectsHelper
     }
   end
 
+  def can_view_operations_tab?(current_user, project)
+    [:read_environment, :read_cluster, :metrics_dashboard].any? do |ability|
+      can?(current_user, ability, project)
+    end
+  end
+
   def search_tab_ability_map
     @search_tab_ability_map ||= tab_ability_map.merge(
       blobs:          :download_code,

app/views/layouts/nav/sidebar/_project.html.haml

@@ -216,7 +216,7 @@
                   =  _('Operations')
             %li.divider.fly-out-top-item
 
-            - if project_nav_tab? :environments
+            - if project_nav_tab? :metrics_dashboards
               = nav_link(controller: :environments, action: [:metrics, :metrics_redirect]) do
                 = link_to metrics_project_environments_path(@project), title: _('Metrics'), class: 'shortcuts-metrics', data: { qa_selector: 'operations_metrics_link' } do
                   %span

spec/helpers/projects_helper_spec.rb

@@ -5,6 +5,9 @@ require 'spec_helper'
 describe ProjectsHelper do
   include ProjectForksHelper
 
+  let_it_be(:project) { create(:project) }
+  let_it_be(:user) { create(:user) }
+
   describe '#project_incident_management_setting' do
     let(:project) { create(:project) }
 
@@ -500,6 +503,23 @@ describe ProjectsHelper do
     end
   end
 
+  describe '#can_view_operations_tab?' do
+    before do
+      allow(helper).to receive(:current_user).and_return(user)
+    end
+
+    subject { helper.send(:can_view_operations_tab?, user, project) }
+
+    [:read_environment, :read_cluster, :metrics_dashboard].each do |ability|
+      it 'includes operations tab' do
+        allow(helper).to receive(:can?).and_return(false)
+        allow(helper).to receive(:can?).with(user, ability, project).and_return(true)
+
+        is_expected.to be(true)
+      end
+    end
+  end
+
   describe '#show_projects' do
     let(:projects) do
       create(:project)