Add PagerDuty incident management worker

app/workers/incident_management/pager_duty/process_incident_worker.rb

+# frozen_string_literal: true
+
+module IncidentManagement
+  module PagerDuty
+    class ProcessIncidentWorker # rubocop:disable Scalability/IdempotentWorker
+      include ApplicationWorker
+
+      queue_namespace :incident_management
+      feature_category :incident_management
+
+      def perform(project_id, incident_payload)
+        return unless project_id
+
+        project = find_project(project_id)
+        return unless project
+
+        result = create_issue(project, incident_payload)
+
+        log_error(result) if result.error?
+      end
+
+      private
+
+      def find_project(project_id)
+        Project.find_by_id(project_id)
+      end
+
+      def create_issue(project, incident_payload)
+        ::IncidentManagement::PagerDuty::CreateIncidentIssueService
+          .new(project, incident_payload)
+          .execute
+      end
+
+      def log_error(result)
+        Gitlab::AppLogger.warn(
+          message: 'Cannot create issue for PagerDuty incident',
+          issue_errors: result.message
+        )
+      end
+    end
+  end
+end

spec/workers/incident_management/pager_duty/process_incident_worker_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IncidentManagement::PagerDuty::ProcessIncidentWorker do
+  let_it_be(:project) { create(:project) }
+
+  describe '#perform' do
+    subject(:perform) { described_class.new.perform(project.id, incident_payload) }
+
+    context 'with valid incident payload' do
+      let(:incident_payload) do
+        {
+          'url' => 'https://webdemo.pagerduty.com/incidents/PRORDTY',
+          'incident_number' => 33,
+          'title' => 'My new incident',
+          'status' => 'triggered',
+          'created_at' => '2017-09-26T15:14:36Z',
+          'urgency' => 'high',
+          'incident_key' => nil,
+          'assignees' => [{
+            'summary' => 'Laura Haley', 'url' => 'https://webdemo.pagerduty.com/users/P553OPV'
+          }],
+          'impacted_services' => [{
+            'summary' => 'Production XDB Cluster', 'url' => 'https://webdemo.pagerduty.com/services/PN49J75'
+          }]
+        }
+      end
+
+      it 'creates a GitLab issue' do
+        expect { perform }.to change(Issue, :count).by(1)
+      end
+    end
+
+    context 'with invalid incident payload' do
+      let(:incident_payload) { {} }
+
+      before do
+        allow(Gitlab::AppLogger).to receive(:warn).and_call_original
+      end
+
+      it 'does not create a GitLab issue' do
+        expect { perform }.not_to change(Issue, :count)
+      end
+
+      it 'logs a warning' do
+        perform
+
+        expect(Gitlab::AppLogger).to have_received(:warn).with(
+          message: 'Cannot create issue for PagerDuty incident',
+          issue_errors: "Title can't be blank"
+        )
+      end
+    end
+  end
+end