Add the "Production" cycle analytics section.

1. Rewrite the `Queries` module to work off a `data_point` hash, with
   `issue` and `merge_request` as keys. The "production" query needs
   both an issue and a merge request to make it's calculation, so it
   makes sense to keep things consistent and provide the same
   data (issue + merge request) for all queries.

app/models/cycle_analytics.rb

 class CycleAnalytics
   def issue
-    issues = Issue.includes(:metrics).where("issue_metrics.id IS NOT NULL").references(:issue_metrics).to_a
-    start_time_fn = -> (issue) { issue.created_at  }
-    calculate_metric(issues, start_time_fn, Queries::issue_first_associated_with_milestone_or_first_added_to_list_label_time)
+    calculate_metric(Queries::issues,
+                     -> (data_point) { data_point[:issue].created_at },
+                     Queries::issue_first_associated_with_milestone_or_first_added_to_list_label_time)
   end
 
   def plan
-    issues = Issue.includes(:metrics).where("issue_metrics.id IS NOT NULL").references(:issue_metrics).to_a
-    calculate_metric(issues,
+    calculate_metric(Queries::issues,
                      Queries::issue_first_associated_with_milestone_or_first_added_to_list_label_time,
                      Queries::issue_closing_merge_request_opened_time)
   end
 
   def code
-    issues = Issue.all.to_a
-    start_time_fn = -> (merge_request) { merge_request.created_at }
-    calculate_metric(Queries::merge_requests_closing_issues(issues),
-                     start_time_fn,
+    calculate_metric(Queries::merge_requests_closing_issues,
+                     -> (data_point) { data_point[:merge_request].created_at },
                      Queries::mr_wip_flag_removed_or_assigned_to_user_other_than_author_time)
   end
 
   def review
-    issues = Issue.all.to_a
-    calculate_metric(Queries::merge_requests_closing_issues(issues),
+    calculate_metric(Queries::merge_requests_closing_issues,
                      Queries::mr_wip_flag_removed_or_assigned_to_user_other_than_author_time,
                      Queries::mr_first_closed_or_merged_at)
   end
 
   def staging
-    issues = Issue.all.to_a
-    calculate_metric(Queries::merge_requests_closing_issues(issues),
+    calculate_metric(Queries::merge_requests_closing_issues,
                      Queries::mr_merged_at,
                      Queries::mr_deployed_to_any_environment_at)
   end
 
+  def production
+    calculate_metric(Queries::merge_requests_closing_issues,
+                     -> (data_point) { data_point[:issue].created_at },
+                     Queries::mr_deployed_to_production_at)
+  end
+
   private
 
   def calculate_metric(data, start_time_fn, end_time_fn)

app/models/cycle_analytics/queries.rb

 class CycleAnalytics
   module Queries
     class << self
-      def merge_requests_closing_issues(issues)
-        issues.map { |issue| issue.closed_by_merge_requests(nil, check_if_open: false) }.flatten
+      def issues
+        Issue.all.to_a.map { |issue| { issue: issue } }
+      end
+
+      def merge_requests_closing_issues
+        issues.map do |data_point|
+          merge_requests = data_point[:issue].closed_by_merge_requests(nil, check_if_open: false)
+          merge_requests.map { |merge_request| { issue: data_point[:issue], merge_request: merge_request } }
+        end.flatten
       end
 
       def issue_first_associated_with_milestone_or_first_added_to_list_label_time
-        lambda do |issue|
+        lambda do |data_point|
+          issue = data_point[:issue]
           if issue.metrics.present?
             issue.metrics.first_associated_with_milestone_at.presence ||
               issue.metrics.first_added_to_board_at.presence
@@ -15,7 +23,8 @@ class CycleAnalytics
       end
 
       def mr_first_closed_or_merged_at
-        lambda do |merge_request|
+        lambda do |data_point|
+          merge_request = data_point[:merge_request]
           if merge_request.metrics.present?
             merge_request.metrics.merged_at.presence || merge_request.metrics.first_closed_at.presence
           end
@@ -23,7 +32,8 @@ class CycleAnalytics
       end
 
       def mr_merged_at
-        lambda do |merge_request|
+        lambda do |data_point|
+          merge_request = data_point[:merge_request]
           if merge_request.metrics.present?
             merge_request.metrics.merged_at
           end
@@ -31,7 +41,8 @@ class CycleAnalytics
       end
 
       def mr_deployed_to_any_environment_at
-        lambda do |merge_request|
+        lambda do |data_point|
+          merge_request = data_point[:merge_request]
           if merge_request.metrics.present?
             deployments = Deployment.where(ref: merge_request.target_branch).where("created_at > ?", merge_request.metrics.merged_at)
             deployment = deployments.order(:created_at).first
@@ -40,15 +51,29 @@ class CycleAnalytics
         end
       end
 
+      def mr_deployed_to_production_at
+        lambda do |data_point|
+          merge_request = data_point[:merge_request]
+          if merge_request.metrics.present?
+            deployments = Deployment.joins(:environment).where(ref: merge_request.target_branch, "environments.name" => "production").
+                          where("deployments.created_at > ?", merge_request.metrics.merged_at)
+            deployment = deployments.order(:created_at).first
+            deployment.created_at if deployment
+          end
+        end
+      end
+
       def issue_closing_merge_request_opened_time
-        lambda do |issue|
+        lambda do |data_point|
+          issue = data_point[:issue]
           merge_requests = issue.closed_by_merge_requests(nil, check_if_open: false)
           merge_requests.map(&:created_at).min if merge_requests.present?
         end
       end
 
       def mr_wip_flag_removed_or_assigned_to_user_other_than_author_time
-        lambda do |merge_request|
+        lambda do |data_point|
+          merge_request = data_point[:merge_request]
           if merge_request.metrics.present?
             merge_request.metrics.wip_flag_first_removed_at.presence ||
               merge_request.metrics.first_assigned_to_user_other_than_author.presence

app/views/projects/cycle_analytics/show.html.haml

@@ -33,3 +33,10 @@
       = distance_of_time_in_words staging
     - else
       = "<Not enough data>"
+
+  %li.list-group-item
+    Production:
+    - if production = @cycle_analytics.production.presence
+      = distance_of_time_in_words production
+    - else
+      = "<Not enough data>"