Add class for group level analytics

Add specs for group level

Update entities

Update base classes

Add groups-centric changes

Update plan and review stage

Add summary classes

Add summary spec

Update specs files

Add to specs test cases for group

Add changelog entry

Add group serializer

Fix typo

Fix typo

Add fetching namespace in sql query

Update specs

Add rubocop fix

Add rubocop fix

Modify method to be in sync with code review

Add counting deploys from subgroup

To group summary stage

Add subgroups handling

In group stage summary

Add additional spec

Add additional specs

Add more precise inheritance

Add attr reader to group level

Fix rubocop offence

Fix problems with specs

Add cr remarks

Renaming median method and a lot of calls in specs

Move spec setup

Rename method in specs

Add code review remarks regarding module

Add proper module name

3 files changed, 36 insertions, 5 deletions

diff --git a/app/models/cycle_analytics/base.rb b/app/models/cycle_analytics/base_methods.rb
index d7b28cd1b67..1c2a0854769 100644
--- a/app/models/cycle_analytics/base.rb
+++ b/app/models/cycle_analytics/base_methods.rb
@@ -1,12 +1,12 @@
 # frozen_string_literal: true
 
 module CycleAnalytics
-  class Base
+  module BaseMethods
     STAGES = %i[issue plan code test review staging production].freeze
 
     def all_medians_by_stage
       STAGES.each_with_object({}) do |stage_name, medians_per_stage|
-        medians_per_stage[stage_name] = self[stage_name].median
+        medians_per_stage[stage_name] = self[stage_name].project_median
       end
     end
 
@@ -21,7 +21,7 @@ module CycleAnalytics
     end
 
     def [](stage_name)
-      Gitlab::CycleAnalytics::Stage[stage_name].new(project: @project, options: @options)
+      Gitlab::CycleAnalytics::Stage[stage_name].new(options: options)
     end
   end
 end
diff --git a/app/models/cycle_analytics/group_level.rb b/app/models/cycle_analytics/group_level.rb
new file mode 100644
index 00000000000..58bd2eb0d9a
--- /dev/null
+++ b/app/models/cycle_analytics/group_level.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module CycleAnalytics
+  class GroupLevel
+    include BaseMethods
+    attr_reader :options
+
+    def initialize(options:)
+      @options = options
+    end
+
+    def summary
+      @summary ||= ::Gitlab::CycleAnalytics::GroupStageSummary.new(options[:group],
+                                                              from: options[:from],
+                                                              current_user: options[:current_user]).data
+    end
+
+    def permissions(user: nil)
+      STAGES.each_with_object({}) do |stage, obj|
+        obj[stage] = true
+      end
+    end
+
+    def stats
+      @stats ||= STAGES.map do |stage_name|
+        self[stage_name].as_json(serializer: GroupAnalyticsStageSerializer)
+      end
+    end
+  end
+end
diff --git a/app/models/cycle_analytics/project_level.rb b/app/models/cycle_analytics/project_level.rb
index 22631cc7d41..abe1be11eae 100644
--- a/app/models/cycle_analytics/project_level.rb
+++ b/app/models/cycle_analytics/project_level.rb
@@ -1,12 +1,13 @@
 # frozen_string_literal: true
 
 module CycleAnalytics
-  class ProjectLevel < Base
+  class ProjectLevel
+    include BaseMethods
     attr_reader :project, :options
 
     def initialize(project, options:)
       @project = project
-      @options = options
+      @options = options.merge(project: project)
     end
 
     def summary