Add a link to kibana logs with time range filter.

https://dev.discourse.org/t/we-need-a-link-to-kibana-logs-direct-from-alert-topics/23527

app/controllers/discourse_prometheus_alert_receiver/receiver_controller.rb

@@ -68,7 +68,8 @@ def receive_grouped_alerts
       Jobs.enqueue(:process_grouped_alerts,
         token: @token,
         data: params[:data].to_json,
-        graph_url: params[:graphURL]
+        graph_url: params[:graphURL],
+        logs_url: params[:logsURL]
       )
 
       render json: success_json

app/jobs/concerns/alert_post_mixin.rb

@@ -65,6 +65,9 @@ def thead(alerts, datacenter, external_link)
       cells += " --- |"
     end
 
+    headers += " |"
+    cells += " --- |"
+
     "#{headers}\n#{cells}"
   end
 
@@ -75,6 +78,8 @@ def alert_item(alert)
       item += " #{description} |"
     end
 
+    item += " [:file_folder:](#{logs_link(alert)}) |"
+
     item
   end
 
@@ -110,6 +115,14 @@ def alert_link(alert)
     url.to_s
   end
 
+  def logs_link(alert)
+    url = "#{alert['logs_url']}#/discover"
+    begin_t = Time.parse(alert['starts_at'])
+    end_t   = Time.parse(alert['ends_at']) rescue Time.zone.now
+
+    "#{url}?_g=(time:(from:'#{begin_t}',mode:absolute,to:'#{end_t}'))"
+  end
+
   def prev_topic_link(topic_id)
     return "" if topic_id.nil?
     created_at = Topic.where(id: topic_id).pluck(:created_at).first

app/jobs/regular/process_grouped_alerts.rb

@@ -12,6 +12,7 @@ def execute(args)
       token = args[:token]
       data = JSON.parse(args[:data])
       graph_url = args[:graph_url]
+      logs_url = args[:logs_url]
 
       receiver = PluginStore.get(
         ::DiscoursePrometheusAlertReceiver::PLUGIN_NAME,