Add new start_time display value

Add start_time to the alert presenter

app/presenters/projects/prometheus/alert_presenter.rb

@@ -45,8 +45,8 @@ module Projects
         project_issues_url(project, label_name: INCIDENT_LABEL_NAME)
       end
 
-      def starts_at
-        super&.rfc3339
+      def start_time
+        starts_at&.strftime('%d %B %Y, %-l:%M%p (%Z)')
       end
 
       def issue_summary_markdown
@@ -73,7 +73,7 @@ module Projects
       def metadata_list
         metadata = []
 
-        metadata << list_item('Start time', starts_at) if starts_at
+        metadata << list_item('Start time', start_time) if start_time
         metadata << list_item('full_query', backtick(full_query)) if full_query
         metadata << list_item(service.label.humanize, service.value) if service
         metadata << list_item(monitoring_tool.label.humanize, monitoring_tool.value) if monitoring_tool
@@ -149,7 +149,7 @@ module Projects
       end
 
       def embed_time
-        starts_at ? Time.rfc3339(starts_at) : Time.current
+        starts_at || Time.current
       end
 
       def alert_embed_window_params(time)

changelogs/unreleased/214109-date-time-format-should-be-consistent-in-the-incident.yml

+---
+title: Add timezone display to alert based issue start time
+merge_request: 32702
+author:
+type: added

lib/gitlab/alerting/alert.rb

@@ -173,7 +173,10 @@ module Gitlab
         value = payload&.dig(field)
         return unless value
 
-        Time.rfc3339(value)
+        # value is a rfc3339 timestamp
+        # Timestamps from Prometheus and Alertmanager are UTC RFC3339 timestamps like: '2018-03-12T09:06:00Z' (Z represents 0 offset or UTC)
+        # .utc sets the datetime zone to `UTC`
+        Time.rfc3339(value).utc
       rescue ArgumentError
       end
 

spec/presenters/projects/prometheus/alert_presenter_spec.rb

@@ -24,18 +24,25 @@ describe Projects::Prometheus::AlertPresenter do
     it { is_expected.to eq(project.full_path) }
   end
 
-  describe '#starts_at' do
-    subject { presenter.starts_at }
+  describe '#start_time' do
+    subject { presenter.start_time }
+
+    let(:starts_at) { '2020-10-31T14:02:04Z' }
 
     before do
       payload['startsAt'] = starts_at
     end
 
-    context 'with valid datetime' do
-      let(:datetime) { Time.now }
-      let(:starts_at) { datetime.rfc3339 }
+    context 'with valid utc datetime' do
+      it { is_expected.to eq('31 October 2020, 2:02PM (UTC)') }
 
-      it { is_expected.to eq(datetime.rfc3339) }
+      context 'with admin time zone not UTC' do
+        before do
+          allow(Time).to receive(:zone).and_return(ActiveSupport::TimeZone.new('Perth'))
+        end
+
+        it { is_expected.to eq('31 October 2020, 2:02PM (UTC)') }
+      end
     end
 
     context 'with invalid datetime' do
@@ -56,7 +63,7 @@ describe Projects::Prometheus::AlertPresenter do
           <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}
+            **Start time:** #{presenter.start_time}
 
           MARKDOWN
         )
@@ -73,7 +80,7 @@ describe Projects::Prometheus::AlertPresenter do
           <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}
+            **Start time:** #{presenter.start_time}
 
             #### Alert Details
 
@@ -94,7 +101,7 @@ describe Projects::Prometheus::AlertPresenter do
           <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}#{markdown_line_break}
+            **Start time:** #{presenter.start_time}#{markdown_line_break}
             **full_query:** `query`
 
           MARKDOWN
@@ -122,7 +129,7 @@ describe Projects::Prometheus::AlertPresenter do
           <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}#{markdown_line_break}
+            **Start time:** #{presenter.start_time}#{markdown_line_break}
             **Service:** service_name#{markdown_line_break}
             **Monitoring tool:** monitoring_tool_name#{markdown_line_break}
             **Hosts:** http://localhost:3000 http://localhost:3001
@@ -144,7 +151,7 @@ describe Projects::Prometheus::AlertPresenter do
             <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}#{markdown_line_break}
+            **Start time:** #{presenter.start_time}#{markdown_line_break}
             **Hosts:** http://localhost:3000
 
             MARKDOWN
@@ -161,7 +168,7 @@ describe Projects::Prometheus::AlertPresenter do
           <<~MARKDOWN.chomp
           #### Summary
 
-          **Start time:** #{presenter.starts_at}#{markdown_line_break}
+          **Start time:** #{presenter.start_time}#{markdown_line_break}
           **full_query:** `avg(metric) > 1.0`
 
           [](#{url})
@@ -253,7 +260,7 @@ describe Projects::Prometheus::AlertPresenter do
             <<~MARKDOWN.chomp
             #### Summary
 
-            **Start time:** #{presenter.starts_at}#{markdown_line_break}
+            **Start time:** #{presenter.start_time}#{markdown_line_break}
             **full_query:** `avg(metric) > 1.0`
 
             MARKDOWN
@@ -280,7 +287,7 @@ describe Projects::Prometheus::AlertPresenter do
               <<~MARKDOWN.chomp
               #### Summary
 
-              **Start time:** #{presenter.starts_at}
+              **Start time:** #{presenter.start_time}
 
               MARKDOWN
             end