Create an environment for self monitoring project

changelogs/unreleased/self-monitoring-env.yml

+---
+title: Create an environment for self monitoring project
+merge_request: 24403
+author:
+type: added

lib/gitlab/database_importers/self_monitoring/project/create_service.rb

@@ -15,6 +15,7 @@ module Gitlab
             :create_group,
             :create_project,
             :save_project_id,
+            :create_environment,
             :add_prometheus_manual_configuration,
             :track_event
 
@@ -80,6 +81,17 @@ module Gitlab
             end
           end
 
+          def create_environment(result)
+            environment = ::Environment.new(project_id: result[:project].id, name: 'production')
+
+            if environment.save
+              success(result)
+            else
+              log_error("Could not create environment for the Self monitoring project. Errors: %{errors}" % { errors: environment.errors.full_messages })
+              error(_('Could not create environment'))
+            end
+          end
+
           def add_prometheus_manual_configuration(result)
             return success(result) unless prometheus_enabled?
             return success(result) unless prometheus_listen_address.present?

locale/gitlab.pot

@@ -5379,6 +5379,9 @@ msgstr ""
 msgid "Could not create Wiki Repository at this time. Please try again later."
 msgstr ""
 
+msgid "Could not create environment"
+msgstr ""
+
 msgid "Could not create group"
 msgstr ""
 

spec/lib/gitlab/database_importers/self_monitoring/project/create_service_spec.rb

@@ -125,6 +125,25 @@ describe Gitlab::DatabaseImporters::SelfMonitoring::Project::CreateService do
         expect(application_setting.self_monitoring_project_id).to eq(project.id)
       end
 
+      it 'creates an environment for the project' do
+        expect(project.default_environment.name).to eq('production')
+      end
+
+      context 'when the environment creation fails' do
+        let(:environment) { build(:environment, name: 'production') }
+
+        it 'returns error' do
+          allow(Environment).to receive(:new).and_return(environment)
+          allow(environment).to receive(:save).and_return(false)
+
+          expect(result).to eq(
+            status: :error,
+            message: 'Could not create environment',
+            last_step: :create_environment
+          )
+        end
+      end
+
       it 'returns error when saving project ID fails' do
         allow(application_setting).to receive(:update).and_call_original
         allow(application_setting).to receive(:update)