Remove feature flag incident_management

After we introduced the Ghost user we can safely
make incident_management generally available.

doc/user/project/integrations/prometheus.md

@@ -158,7 +158,7 @@ receivers:
 
 ### Taking action on an alert **[ULTIMATE]**
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/4925) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.9.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/4925) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.10.
 
 Alerts can be used to trigger actions, like open an issue automatically. To configure the actions:
 
@@ -172,25 +172,6 @@ Once enabled, an issue will be opened automatically when an alert is triggered.
 
 If the metric exceeds the threshold of the alert for over 5 minutes, an email will be sent to all [Maintainers and Owners](../../permissions.md#project-members-permissions) of the project.
 
-**Note:**
-If you are running a self-managed instance, the new interface shown on
-this page will not be available unless the feature flag
-`incident_management` is enabled, which can be done from the Rails console by
-instance administrators.
-
-Use these commands to start the Rails console:
-
-```sh
-# Omnibus GitLab
-gitlab-rails console
-
-# Installation from source
-cd /home/git/gitlab
-sudo -u git -H bin/rails console RAILS_ENV=production
-```
-
-Then run `Feature.enable(:incident_management)` to enable the feature flag.
-
 ## Determining the performance impact of a merge
 
 > [Introduced][ce-10408] in GitLab 9.2.

ee/app/controllers/ee/projects/settings/operations_controller.rb

@@ -50,16 +50,8 @@ module EE
             project.feature_available?(:tracing, current_user)
           end
 
-          def has_incident_management_license?
-            project.feature_available?(:incident_management, current_user)
-          end
-
-          def incident_management_feature_enabled?
-            ::Feature.enabled?(:incident_management)
-          end
-
           def incident_management_available?
-            incident_management_feature_enabled? && has_incident_management_license?
+            project.feature_available?(:incident_management, current_user)
           end
         end
 

ee/app/services/projects/prometheus/alerts/notify_service.rb

@@ -19,16 +19,8 @@ module Projects
 
         private
 
-        def has_incident_management_license?
-          project.feature_available?(:incident_management)
-        end
-
-        def incident_management_feature_enabled?
-          Feature.enabled?(:incident_management)
-        end
-
         def incident_management_available?
-          has_incident_management_license? && incident_management_feature_enabled?
+          project.feature_available?(:incident_management)
         end
 
         def incident_management_setting

ee/changelogs/unreleased/pl-remove-feature-flag-incident-management.yml

+---
+title: Remove feature flag `:incident_management`
+merge_request: 10569
+author:
+type: added

ee/spec/controllers/projects/settings/operations_controller_spec.rb

@@ -392,16 +392,6 @@ describe Projects::Settings::OperationsController do
       it_behaves_like 'user without write access', :internal, :maintainer
     end
 
-    context 'with incident_management feature flag disabled' do
-      before do
-        stub_feature_flags(incident_management: false)
-      end
-
-      it_behaves_like 'user without write access', :public, :maintainer
-      it_behaves_like 'user without write access', :private, :maintainer
-      it_behaves_like 'user without write access', :internal, :maintainer
-    end
-
     private
 
     def update_project(project, tracing_params: nil, incident_management_params: nil)

ee/spec/services/projects/prometheus/alerts/notify_service_spec.rb

@@ -110,8 +110,6 @@ describe Projects::Prometheus::Alerts::NotifyService do
 
       with_them do
         before do
-          stub_feature_flags(incident_management: false)
-
           cluster = create(:cluster, :provided_by_user,
                            projects: [project],
                            enabled: cluster_enabled)
@@ -151,8 +149,6 @@ describe Projects::Prometheus::Alerts::NotifyService do
       end
 
       before do
-        stub_feature_flags(incident_management: false)
-
         stub_licensed_features(multiple_clusters: true)
 
         create(:clusters_applications_prometheus, :installed,
@@ -193,8 +189,6 @@ describe Projects::Prometheus::Alerts::NotifyService do
         let(:alert_manager_token) { token_input }
 
         before do
-          stub_feature_flags(incident_management: false)
-
           create(:prometheus_service, project: project)
 
           if alerting_setting
@@ -215,18 +209,6 @@ describe Projects::Prometheus::Alerts::NotifyService do
       end
     end
 
-    context 'incident_management feature flag disabled' do
-      before do
-        create(:prometheus_service, project: project)
-        create(:project_alerting_setting, project: project, token: token)
-        create(:project_incident_management_setting, send_email: true, project: project)
-
-        stub_feature_flags(incident_management: false)
-      end
-
-      it_behaves_like 'notifies alerts'
-    end
-
     context 'no incident_management license' do
       before do
         create(:prometheus_service, project: project)