Split alert body into two sections

Split alert issue's body into Summary and Alert Details sections

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

@@ -35,10 +35,10 @@ module Projects
 
       def issue_summary_markdown
         <<~MARKDOWN.chomp
-          ## Summary
+          #### Summary
 
           #{metadata_list}
-          #{annotation_list}
+          #{alert_details}
         MARKDOWN
       end
 
@@ -63,6 +63,17 @@ module Projects
         metadata.join("\n")
       end
 
+      def alert_details
+        if annotation_list.present?
+          <<~MARKDOWN.chomp
+
+            #### Alert Details
+
+            #{annotation_list}
+          MARKDOWN
+        end
+      end
+
       def annotation_list
         strong_memoize(:annotation_list) do
           annotations

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

@@ -43,7 +43,7 @@ describe Projects::Prometheus::AlertPresenter do
       it do
         is_expected.to eq(
           <<~MARKDOWN.chomp
-            ## Summary
+            #### Summary
 
             * starts_at: #{presenter.starts_at}
 
@@ -60,9 +60,12 @@ describe Projects::Prometheus::AlertPresenter do
       it do
         is_expected.to eq(
           <<~MARKDOWN.chomp
-            ## Summary
+            #### Summary
 
             * starts_at: #{presenter.starts_at}
+
+            #### Alert Details
+
             * foo: value1
             * bar: value2
           MARKDOWN
@@ -78,7 +81,7 @@ describe Projects::Prometheus::AlertPresenter do
       it do
         is_expected.to eq(
           <<~MARKDOWN.chomp
-            ## Summary
+            #### Summary
 
             * starts_at: #{presenter.starts_at}
             * full_query: `query`