Remove unnecessary duplication of alert’s title

There is no need to display an Alert's title as a separate parameter
for the Generic and Prometheus-specific alerts.
It is already set as an issue title.

ee/app/presenters/projects/prometheus/alert_presenter.rb

@@ -3,7 +3,7 @@
 module Projects
   module Prometheus
     class AlertPresenter < Gitlab::View::Presenter::Delegated
-      RESERVED_ANNOTATIONS = %w(gitlab_incident_markdown).freeze
+      RESERVED_ANNOTATIONS = %w(gitlab_incident_markdown title).freeze
       GENERIC_ALERT_SUMMARY_ANNOTATIONS = %w(monitoring_tool service hosts).freeze
       MARKDOWN_LINE_BREAK = "  \n".freeze
 

ee/changelogs/unreleased/remove-duplicated-title-from-alert-details.yml

+---
+title: Get rid of unnecessary duplication of alert’s title from Alert Details
+merge_request: 19214
+author:
+type: changed

ee/spec/presenters/projects/prometheus/alert_presenter_spec.rb

@@ -56,7 +56,7 @@ describe Projects::Prometheus::AlertPresenter do
 
     context 'with annotations' do
       before do
-        payload['annotations'] = { 'foo' => 'value1', 'bar' => 'value2' }
+        payload['annotations'] = { 'title' => 'Alert Title', 'foo' => 'value1', 'bar' => 'value2' }
       end
 
       it do
@@ -120,7 +120,6 @@ describe Projects::Prometheus::AlertPresenter do
 
             #### Alert Details
 
-            **title:** The Generic Alert Title#{markdown_line_break}
             **description:** The Generic Alert Description
           MARKDOWN
         )

ee/spec/services/incident_management/create_issue_service_spec.rb

@@ -41,7 +41,7 @@ describe IncidentManagement::CreateIssueService do
 
         expect(issue.author).to eq(user)
         expect(issue.title).to eq(alert_title)
-        expect(issue.description).to include(alert_presenter.issue_summary_markdown)
+        expect(issue.description).to include(alert_presenter.issue_summary_markdown.strip)
         expect(separator_count(issue.description)).to eq 0
       end
     end
@@ -170,7 +170,7 @@ describe IncidentManagement::CreateIssueService do
         expect(issue.title).to include(gitlab_alert.environment.name)
         expect(issue.title).to include(query_title)
         expect(issue.title).to include('for 5 minutes')
-        expect(issue.description).to include(alert_presenter.issue_summary_markdown)
+        expect(issue.description).to include(alert_presenter.issue_summary_markdown.strip)
         expect(separator_count(issue.description)).to eq 0
       end
     end