Merge branch '41777-include-cycle-time-in-usage-ping' into 'master'

Resolve "Include cycle time in usage ping"

Closes #41777

See merge request gitlab-org/gitlab-ce!16793

28 files changed, 498 insertions, 134 deletions

diff --git a/app/models/cycle_analytics.rb b/app/models/cycle_analytics.rb
index d2e626c22e8..b34d1382d43 100644
--- a/app/models/cycle_analytics.rb
+++ b/app/models/cycle_analytics.rb
@@ -6,6 +6,12 @@ class CycleAnalytics
     @options = options
   end
 
+  def all_medians_per_stage
+    STAGES.each_with_object({}) do |stage_name, medians_per_stage|
+      medians_per_stage[stage_name] = self[stage_name].median
+    end
+  end
+
   def summary
     @summary ||= ::Gitlab::CycleAnalytics::StageSummary.new(@project,
                                                             from: @options[:from],
diff --git a/app/serializers/analytics_stage_entity.rb b/app/serializers/analytics_stage_entity.rb
index 564612202b5..3e355a13e06 100644
--- a/app/serializers/analytics_stage_entity.rb
+++ b/app/serializers/analytics_stage_entity.rb
@@ -7,6 +7,7 @@ class AnalyticsStageEntity < Grape::Entity
   expose :description
 
   expose :median, as: :value do |stage|
-    stage.median && !stage.median.zero? ? distance_of_time_in_words(stage.median) : nil
+    # median returns a BatchLoader instance which we first have to unwrap by using to_i
+    !stage.median.to_i.zero? ? distance_of_time_in_words(stage.median) : nil
   end
 end
diff --git a/changelogs/unreleased/41777-include-cycle-time-in-usage-ping.yml b/changelogs/unreleased/41777-include-cycle-time-in-usage-ping.yml
new file mode 100644
index 00000000000..8d8a5dfefa3
--- /dev/null
+++ b/changelogs/unreleased/41777-include-cycle-time-in-usage-ping.yml
@@ -0,0 +1,5 @@
+---
+title: Include cycle time in usage ping data
+merge_request: 16973
+author:
+type: added
diff --git a/lib/gitlab/cycle_analytics/base_query.rb b/lib/gitlab/cycle_analytics/base_query.rb
index 8b3bc3e440d..86d708be0d6 100644
--- a/lib/gitlab/cycle_analytics/base_query.rb
+++ b/lib/gitlab/cycle_analytics/base_query.rb
@@ -8,13 +8,14 @@ module Gitlab
       private
 
       def base_query
-        @base_query ||= stage_query
+        @base_query ||= stage_query(@project.id) # rubocop:disable Gitlab/ModuleWithInstanceVariables
       end
 
-      def stage_query
+      def stage_query(project_ids)
         query = mr_closing_issues_table.join(issue_table).on(issue_table[:id].eq(mr_closing_issues_table[:issue_id]))
           .join(issue_metrics_table).on(issue_table[:id].eq(issue_metrics_table[:issue_id]))
-          .where(issue_table[:project_id].eq(@project.id)) # rubocop:disable Gitlab/ModuleWithInstanceVariables
+          .project(issue_table[:project_id].as("project_id"))
+          .where(issue_table[:project_id].in(project_ids))
           .where(issue_table[:created_at].gteq(@options[:from])) # rubocop:disable Gitlab/ModuleWithInstanceVariables
 
         # Load merge_requests
diff --git a/lib/gitlab/cycle_analytics/base_stage.rb b/lib/gitlab/cycle_analytics/base_stage.rb
index cac31ea8cff..038d5a19bc4 100644
--- a/lib/gitlab/cycle_analytics/base_stage.rb
+++ b/lib/gitlab/cycle_analytics/base_stage.rb
@@ -21,17 +21,28 @@ module Gitlab
       end
 
       def median
-        cte_table = Arel::Table.new("cte_table_for_#{name}")
+        BatchLoader.for(@project.id).batch(key: name) do |project_ids, loader|
+          cte_table = Arel::Table.new("cte_table_for_#{name}")
 
-        # Build a `SELECT` query. We find the first of the `end_time_attrs` that isn't `NULL` (call this end_time).
-        # Next, we find the first of the start_time_attrs that isn't `NULL` (call this start_time).
-        # We compute the (end_time - start_time) interval, and give it an alias based on the current
-        # cycle analytics stage.
-        interval_query = Arel::Nodes::As.new(
-          cte_table,
-          subtract_datetimes(base_query.dup, start_time_attrs, end_time_attrs, name.to_s))
+          # Build a `SELECT` query. We find the first of the `end_time_attrs` that isn't `NULL` (call this end_time).
+          # Next, we find the first of the start_time_attrs that isn't `NULL` (call this start_time).
+          # We compute the (end_time - start_time) interval, and give it an alias based on the current
+          # cycle analytics stage.
+          interval_query = Arel::Nodes::As.new(cte_table,
+            subtract_datetimes(stage_query(project_ids), start_time_attrs, end_time_attrs, name.to_s))
 
-        median_datetime(cte_table, interval_query, name)
+          if project_ids.one?
+            loader.call(@project.id, median_datetime(cte_table, interval_query, name))
+          else
+            begin
+              median_datetimes(cte_table, interval_query, name, :project_id)&.each do |project_id, median|
+                loader.call(project_id, median)
+              end
+            rescue NotSupportedError
+              {}
+            end
+          end
+        end
       end
 
       def name
diff --git a/lib/gitlab/cycle_analytics/production_helper.rb b/lib/gitlab/cycle_analytics/production_helper.rb
index 7a889b3877f..d0ca62e46e4 100644
--- a/lib/gitlab/cycle_analytics/production_helper.rb
+++ b/lib/gitlab/cycle_analytics/production_helper.rb
@@ -1,8 +1,8 @@
 module Gitlab
   module CycleAnalytics
     module ProductionHelper
-      def stage_query
-        super
+      def stage_query(project_ids)
+        super(project_ids)
           .where(mr_metrics_table[:first_deployed_to_production_at]
           .gteq(@options[:from])) # rubocop:disable Gitlab/ModuleWithInstanceVariables
       end
diff --git a/lib/gitlab/cycle_analytics/test_stage.rb b/lib/gitlab/cycle_analytics/test_stage.rb
index 2b5f72bef89..0e9d235ca79 100644
--- a/lib/gitlab/cycle_analytics/test_stage.rb
+++ b/lib/gitlab/cycle_analytics/test_stage.rb
@@ -25,11 +25,11 @@ module Gitlab
         _("Total test time for all commits/merges")
       end
 
-      def stage_query
+      def stage_query(project_ids)
         if @options[:branch]
-          super.where(build_table[:ref].eq(@options[:branch]))
+          super(project_ids).where(build_table[:ref].eq(@options[:branch]))
         else
-          super
+          super(project_ids)
         end
       end
     end
diff --git a/lib/gitlab/cycle_analytics/usage_data.rb b/lib/gitlab/cycle_analytics/usage_data.rb
new file mode 100644
index 00000000000..5122e3417ca
--- /dev/null
+++ b/lib/gitlab/cycle_analytics/usage_data.rb
@@ -0,0 +1,72 @@
+module Gitlab
+  module CycleAnalytics
+    class UsageData
+      PROJECTS_LIMIT = 10
+
+      attr_reader :projects, :options
+
+      def initialize
+        @projects = Project.sorted_by_activity.limit(PROJECTS_LIMIT)
+        @options = { from: 7.days.ago }
+      end
+
+      def to_json
+        total = 0
+
+        values =
+          medians_per_stage.each_with_object({}) do |(stage_name, medians), hsh|
+            calculations = stage_values(medians)
+
+            total += calculations.values.compact.sum
+            hsh[stage_name] = calculations
+          end
+
+        values[:total] = total
+
+        { avg_cycle_analytics: values }
+      end
+
+      private
+
+      def medians_per_stage
+        projects.each_with_object({}) do |project, hsh|
+          ::CycleAnalytics.new(project, options).all_medians_per_stage.each do |stage_name, median|
+            hsh[stage_name] ||= []
+            hsh[stage_name] << median
+          end
+        end
+      end
+
+      def stage_values(medians)
+        medians = medians.map(&:presence).compact
+        average = calc_average(medians)
+
+        {
+          average: average,
+          sd: standard_deviation(medians, average),
+          missing: projects.length - medians.length
+        }
+      end
+
+      def calc_average(values)
+        return if values.empty?
+
+        (values.sum / values.length).to_i
+      end
+
+      def standard_deviation(values, average)
+        Math.sqrt(sample_variance(values, average)).to_i
+      end
+
+      def sample_variance(values, average)
+        return 0 if values.length <= 1
+
+        sum = values.inject(0) do |acc, val|
+          acc + (val - average)**2
+        end
+
+        sum / (values.length - 1)
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/database/median.rb b/lib/gitlab/database/median.rb
index 059054ac9ff..74fed447289 100644
--- a/lib/gitlab/database/median.rb
+++ b/lib/gitlab/database/median.rb
@@ -2,18 +2,14 @@
 module Gitlab
   module Database
     module Median
+      NotSupportedError = Class.new(StandardError)
+
       def median_datetime(arel_table, query_so_far, column_sym)
-        median_queries =
-          if Gitlab::Database.postgresql?
-            pg_median_datetime_sql(arel_table, query_so_far, column_sym)
-          elsif Gitlab::Database.mysql?
-            mysql_median_datetime_sql(arel_table, query_so_far, column_sym)
-          end
-
-        results = Array.wrap(median_queries).map do |query|
-          ActiveRecord::Base.connection.execute(query)
-        end
-        extract_median(results).presence
+        extract_median(execute_queries(arel_table, query_so_far, column_sym)).presence
+      end
+
+      def median_datetimes(arel_table, query_so_far, column_sym, partition_column)
+        extract_medians(execute_queries(arel_table, query_so_far, column_sym, partition_column)).presence
       end
 
       def extract_median(results)
@@ -21,13 +17,21 @@ module Gitlab
 
         if Gitlab::Database.postgresql?
           result = result.first.presence
-          median = result['median'] if result
-          median.to_f if median
+
+          result['median']&.to_f if result
         elsif Gitlab::Database.mysql?
           result.to_a.flatten.first
         end
       end
 
+      def extract_medians(results)
+        median_values = results.compact.first.values
+
+        median_values.each_with_object({}) do |(id, median), hash|
+          hash[id.to_i] = median&.to_f
+        end
+      end
+
       def mysql_median_datetime_sql(arel_table, query_so_far, column_sym)
         query = arel_table
                 .from(arel_table.project(Arel.sql('*')).order(arel_table[column_sym]).as(arel_table.table_name))
@@ -53,7 +57,7 @@ module Gitlab
         ]
       end
 
-      def pg_median_datetime_sql(arel_table, query_so_far, column_sym)
+      def pg_median_datetime_sql(arel_table, query_so_far, column_sym, partition_column = nil)
         # Create a CTE with the column we're operating on, row number (after sorting by the column
         # we're operating on), and count of the table we're operating on (duplicated across) all rows
         # of the CTE. For example, if we're looking to find the median of the `projects.star_count`
@@ -64,41 +68,107 @@ module Gitlab
         #           5 |      1 |  3
         #           9 |      2 |  3
         #          15 |      3 |  3
+        #
+        #  If a partition column is used we will do the same operation but for separate partitions,
+        #  when that happens the CTE might look like this:
+        #
+        #  project_id | star_count | row_id | ct
+        # ------------+------------+--------+----
+        #           1 |          5 |     1 |  2
+        #           1 |          9 |     2 |  2
+        #           2 |         10 |     1 |  3
+        #           2 |         15 |     2 |  3
+        #           2 |         20 |     3 |  3
         cte_table = Arel::Table.new("ordered_records")
+
         cte = Arel::Nodes::As.new(
           cte_table,
-          arel_table
-            .project(
-              arel_table[column_sym].as(column_sym.to_s),
-              Arel::Nodes::Over.new(Arel::Nodes::NamedFunction.new("row_number", []),
-                                    Arel::Nodes::Window.new.order(arel_table[column_sym])).as('row_id'),
-              arel_table.project("COUNT(1)").as('ct')).
+          arel_table.project(*rank_rows(arel_table, column_sym, partition_column)).
             # Disallow negative values
             where(arel_table[column_sym].gteq(zero_interval)))
 
         # From the CTE, select either the middle row or the middle two rows (this is accomplished
         # by 'where cte.row_id between cte.ct / 2.0 AND cte.ct / 2.0 + 1'). Find the average of the
         # selected rows, and this is the median value.
-        cte_table.project(average([extract_epoch(cte_table[column_sym])], "median"))
-          .where(
-            Arel::Nodes::Between.new(
-              cte_table[:row_id],
-              Arel::Nodes::And.new(
-                [(cte_table[:ct] / Arel.sql('2.0')),
-                 (cte_table[:ct] / Arel.sql('2.0') + 1)]
+        result =
+          cte_table
+            .project(*median_projections(cte_table, column_sym, partition_column))
+            .where(
+              Arel::Nodes::Between.new(
+                cte_table[:row_id],
+                Arel::Nodes::And.new(
+                  [(cte_table[:ct] / Arel.sql('2.0')),
+                   (cte_table[:ct] / Arel.sql('2.0') + 1)]
+                )
               )
             )
-          )
-          .with(query_so_far, cte)
-          .to_sql
+            .with(query_so_far, cte)
+
+        result.group(cte_table[partition_column]).order(cte_table[partition_column]) if partition_column
+
+        result.to_sql
       end
 
       private
 
+      def median_queries(arel_table, query_so_far, column_sym, partition_column = nil)
+        if Gitlab::Database.postgresql?
+          pg_median_datetime_sql(arel_table, query_so_far, column_sym, partition_column)
+        elsif Gitlab::Database.mysql?
+          raise NotSupportedError, "partition_column is not supported for MySQL" if partition_column
+
+          mysql_median_datetime_sql(arel_table, query_so_far, column_sym)
+        end
+      end
+
+      def execute_queries(arel_table, query_so_far, column_sym, partition_column = nil)
+        queries = median_queries(arel_table, query_so_far, column_sym, partition_column)
+
+        Array.wrap(queries).map { |query| ActiveRecord::Base.connection.execute(query) }
+      end
+
       def average(args, as)
         Arel::Nodes::NamedFunction.new("AVG", args, as)
       end
 
+      def rank_rows(arel_table, column_sym, partition_column)
+        column_row = arel_table[column_sym].as(column_sym.to_s)
+
+        if partition_column
+          partition_row = arel_table[partition_column]
+          row_id =
+            Arel::Nodes::Over.new(
+              Arel::Nodes::NamedFunction.new('rank', []),
+              Arel::Nodes::Window.new.partition(arel_table[partition_column])
+                .order(arel_table[column_sym])
+            ).as('row_id')
+
+          count = arel_table.from(arel_table.alias)
+                    .project('COUNT(*)')
+                    .where(arel_table[partition_column].eq(arel_table.alias[partition_column]))
+                    .as('ct')
+
+          [partition_row, column_row, row_id, count]
+        else
+          row_id =
+            Arel::Nodes::Over.new(
+              Arel::Nodes::NamedFunction.new('row_number', []),
+              Arel::Nodes::Window.new.order(arel_table[column_sym])
+            ).as('row_id')
+
+          count = arel_table.project("COUNT(1)").as('ct')
+
+          [column_row, row_id, count]
+        end
+      end
+
+      def median_projections(table, column_sym, partition_column)
+        projections = []
+        projections << table[partition_column] if partition_column
+        projections << average([extract_epoch(table[column_sym])], "median")
+        projections
+      end
+
       def extract_epoch(arel_attribute)
         Arel.sql(%Q{EXTRACT(EPOCH FROM "#{arel_attribute.relation.name}"."#{arel_attribute.name}")})
       end
diff --git a/lib/gitlab/usage_data.rb b/lib/gitlab/usage_data.rb
index 9d13d1d781f..37d3512990e 100644
--- a/lib/gitlab/usage_data.rb
+++ b/lib/gitlab/usage_data.rb
@@ -9,6 +9,7 @@ module Gitlab
         license_usage_data.merge(system_usage_data)
                           .merge(features_usage_data)
                           .merge(components_usage_data)
+                          .merge(cycle_analytics_usage_data)
       end
 
       def to_json(force_refresh: false)
@@ -71,6 +72,10 @@ module Gitlab
         }
       end
 
+      def cycle_analytics_usage_data
+        Gitlab::CycleAnalytics::UsageData.new.to_json
+      end
+
       def features_usage_data
         features_usage_data_ce
       end
diff --git a/spec/controllers/projects/cycle_analytics_controller_spec.rb b/spec/controllers/projects/cycle_analytics_controller_spec.rb
index 7c708a418a7..5516c95d044 100644
--- a/spec/controllers/projects/cycle_analytics_controller_spec.rb
+++ b/spec/controllers/projects/cycle_analytics_controller_spec.rb
@@ -27,7 +27,7 @@ describe Projects::CycleAnalyticsController do
         milestone = create(:milestone, project: project, created_at: 5.days.ago)
         issue.update(milestone: milestone)
 
-        create_merge_request_closing_issue(issue)
+        create_merge_request_closing_issue(user, project, issue)
       end
 
       it 'is false' do
diff --git a/spec/features/cycle_analytics_spec.rb b/spec/features/cycle_analytics_spec.rb
index 510677ecf56..ef493db3f11 100644
--- a/spec/features/cycle_analytics_spec.rb
+++ b/spec/features/cycle_analytics_spec.rb
@@ -6,7 +6,7 @@ feature 'Cycle Analytics', :js do
   let(:project) { create(:project, :repository) }
   let(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
   let(:milestone) { create(:milestone, project: project) }
-  let(:mr) { create_merge_request_closing_issue(issue, commit_message: "References #{issue.to_reference}") }
+  let(:mr) { create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}") }
   let(:pipeline) { create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr) }
 
   context 'as an allowed user' do
@@ -41,8 +41,8 @@ feature 'Cycle Analytics', :js do
         allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([issue])
         project.add_master(user)
 
-        create_cycle
-        deploy_master
+        @build = create_cycle(user, project, issue, mr, milestone, pipeline)
+        deploy_master(user, project)
 
         sign_in(user)
         visit project_cycle_analytics_path(project)
@@ -117,8 +117,8 @@ feature 'Cycle Analytics', :js do
       project.add_guest(guest)
 
       allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([issue])
-      create_cycle
-      deploy_master
+      create_cycle(user, project, issue, mr, milestone, pipeline)
+      deploy_master(user, project)
 
       sign_in(guest)
       visit project_cycle_analytics_path(project)
@@ -166,16 +166,6 @@ feature 'Cycle Analytics', :js do
     expect(find('.stage-events')).to have_content("!#{mr.iid}")
   end
 
-  def create_cycle
-    issue.update(milestone: milestone)
-    pipeline.run
-
-    @build = create(:ci_build, pipeline: pipeline, status: :success, author: user)
-
-    merge_merge_requests_closing_issue(issue)
-    ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.to_hash)
-  end
-
   def click_stage(stage_name)
     find('.stage-nav li', text: stage_name).click
     wait_for_requests
diff --git a/spec/lib/gitlab/cycle_analytics/base_event_fetcher_spec.rb b/spec/lib/gitlab/cycle_analytics/base_event_fetcher_spec.rb
index 3fe0493ed9b..8b07da11c5d 100644
--- a/spec/lib/gitlab/cycle_analytics/base_event_fetcher_spec.rb
+++ b/spec/lib/gitlab/cycle_analytics/base_event_fetcher_spec.rb
@@ -41,7 +41,7 @@ describe Gitlab::CycleAnalytics::BaseEventFetcher do
       milestone = create(:milestone, project: project)
 
       issue.update(milestone: milestone)
-      create_merge_request_closing_issue(issue)
+      create_merge_request_closing_issue(user, project, issue)
     end
   end
 end
diff --git a/spec/lib/gitlab/cycle_analytics/events_spec.rb b/spec/lib/gitlab/cycle_analytics/events_spec.rb
index 38a47a159e1..397dd4e5d2c 100644
--- a/spec/lib/gitlab/cycle_analytics/events_spec.rb
+++ b/spec/lib/gitlab/cycle_analytics/events_spec.rb
@@ -236,8 +236,8 @@ describe 'cycle analytics events' do
       pipeline.run!
       pipeline.succeed!
 
-      merge_merge_requests_closing_issue(context)
-      deploy_master
+      merge_merge_requests_closing_issue(user, project, context)
+      deploy_master(user, project)
     end
 
     it 'has the name' do
@@ -294,8 +294,8 @@ describe 'cycle analytics events' do
     let!(:context) { create(:issue, project: project, created_at: 2.days.ago) }
 
     before do
-      merge_merge_requests_closing_issue(context)
-      deploy_master
+      merge_merge_requests_closing_issue(user, project, context)
+      deploy_master(user, project)
     end
 
     it 'has the total time' do
@@ -334,7 +334,7 @@ describe 'cycle analytics events' do
   def setup(context)
     milestone = create(:milestone, project: project)
     context.update(milestone: milestone)
-    mr = create_merge_request_closing_issue(context, commit_message: "References #{context.to_reference}")
+    mr = create_merge_request_closing_issue(user, project, context, commit_message: "References #{context.to_reference}")
 
     ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.to_hash)
   end
diff --git a/spec/lib/gitlab/cycle_analytics/usage_data_spec.rb b/spec/lib/gitlab/cycle_analytics/usage_data_spec.rb
new file mode 100644
index 00000000000..56a316318cb
--- /dev/null
+++ b/spec/lib/gitlab/cycle_analytics/usage_data_spec.rb
@@ -0,0 +1,140 @@
+require 'spec_helper'
+
+describe Gitlab::CycleAnalytics::UsageData do
+  describe '#to_json' do
+    before do
+      Timecop.freeze do
+        user = create(:user, :admin)
+        projects = create_list(:project, 2, :repository)
+
+        projects.each_with_index do |project, time|
+          issue = create(:issue, project: project, created_at: (time + 1).hour.ago)
+
+          allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([issue])
+
+          milestone = create(:milestone, project: project)
+          mr = create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}")
+          pipeline = create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr)
+
+          create_cycle(user, project, issue, mr, milestone, pipeline)
+          deploy_master(user, project, environment: 'staging')
+          deploy_master(user, project)
+        end
+      end
+    end
+
+    shared_examples 'a valid usage data result' do
+      it 'returns the aggregated usage data of every selected project' do
+        result = subject.to_json
+
+        expect(result).to have_key(:avg_cycle_analytics)
+
+        CycleAnalytics::STAGES.each do |stage|
+          expect(result[:avg_cycle_analytics]).to have_key(stage)
+
+          stage_values    = result[:avg_cycle_analytics][stage]
+          expected_values = expect_values_per_stage[stage]
+
+          expected_values.each_pair do |op, value|
+            expect(stage_values).to have_key(op)
+
+            if op == :missing
+              expect(stage_values[op]).to eq(value)
+            else
+              # delta is used because of git timings that Timecop does not stub
+              expect(stage_values[op].to_i).to be_within(5).of(value.to_i)
+            end
+          end
+        end
+      end
+    end
+
+    context 'when using postgresql', :postgresql do
+      let(:expect_values_per_stage) do
+        {
+          issue: {
+            average: 5400,
+            sd: 2545,
+            missing: 0
+          },
+          plan: {
+            average: 2,
+            sd: 2,
+            missing: 0
+          },
+          code: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          test: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          review: {
+            average: 0,
+            sd: 0,
+            missing: 0
+          },
+          staging: {
+            average: 0,
+            sd: 0,
+            missing: 0
+          },
+          production: {
+            average: 5400,
+            sd: 2545,
+            missing: 0
+          }
+        }
+      end
+
+      it_behaves_like 'a valid usage data result'
+    end
+
+    context 'when using mysql', :mysql do
+      let(:expect_values_per_stage) do
+        {
+          issue: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          plan: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          code: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          test: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          review: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          staging: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          },
+          production: {
+            average: nil,
+            sd: 0,
+            missing: 2
+          }
+        }
+      end
+
+      it_behaves_like 'a valid usage data result'
+    end
+  end
+end
diff --git a/spec/lib/gitlab/database/median_spec.rb b/spec/lib/gitlab/database/median_spec.rb
new file mode 100644
index 00000000000..1b5e30089ce
--- /dev/null
+++ b/spec/lib/gitlab/database/median_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe Gitlab::Database::Median do
+  let(:dummy_class) do
+    Class.new do
+      include Gitlab::Database::Median
+    end
+  end
+
+  subject(:median) { dummy_class.new }
+
+  describe '#median_datetimes' do
+    it 'raises NotSupportedError', :mysql do
+      expect { median.median_datetimes(nil, nil, nil, :project_id) }.to raise_error(dummy_class::NotSupportedError, "partition_column is not supported for MySQL")
+    end
+  end
+end
diff --git a/spec/lib/gitlab/usage_data_spec.rb b/spec/lib/gitlab/usage_data_spec.rb
index 0e9ecff25a6..138d21ede97 100644
--- a/spec/lib/gitlab/usage_data_spec.rb
+++ b/spec/lib/gitlab/usage_data_spec.rb
@@ -36,6 +36,7 @@ describe Gitlab::UsageData do
         gitlab_shared_runners
         git
         database
+        avg_cycle_analytics
       ))
     end
 
diff --git a/spec/models/cycle_analytics/code_spec.rb b/spec/models/cycle_analytics/code_spec.rb
index f2f1928926c..6a6b58fb52b 100644
--- a/spec/models/cycle_analytics/code_spec.rb
+++ b/spec/models/cycle_analytics/code_spec.rb
@@ -18,11 +18,11 @@ describe 'CycleAnalytics#code' do
                                end]],
       end_time_conditions: [["merge request that closes issue is created",
                              -> (context, data) do
-                               context.create_merge_request_closing_issue(data[:issue])
+                               context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
                              end]],
       post_fn: -> (context, data) do
-        context.merge_merge_requests_closing_issue(data[:issue])
-        context.deploy_master
+        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
+        context.deploy_master(context.user, context.project)
       end)
 
     context "when a regular merge request (that doesn't close the issue) is created" do
@@ -30,10 +30,10 @@ describe 'CycleAnalytics#code' do
         issue = create(:issue, project: project)
 
         create_commit_referencing_issue(issue)
-        create_merge_request_closing_issue(issue, message: "Closes nothing")
+        create_merge_request_closing_issue(user, project, issue, message: "Closes nothing")
 
-        merge_merge_requests_closing_issue(issue)
-        deploy_master
+        merge_merge_requests_closing_issue(user, project, issue)
+        deploy_master(user, project)
 
         expect(subject[:code].median).to be_nil
       end
@@ -50,10 +50,10 @@ describe 'CycleAnalytics#code' do
                                end]],
       end_time_conditions: [["merge request that closes issue is created",
                              -> (context, data) do
-                               context.create_merge_request_closing_issue(data[:issue])
+                               context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
                              end]],
       post_fn: -> (context, data) do
-        context.merge_merge_requests_closing_issue(data[:issue])
+        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
       end)
 
     context "when a regular merge request (that doesn't close the issue) is created" do
@@ -61,9 +61,9 @@ describe 'CycleAnalytics#code' do
         issue = create(:issue, project: project)
 
         create_commit_referencing_issue(issue)
-        create_merge_request_closing_issue(issue, message: "Closes nothing")
+        create_merge_request_closing_issue(user, project, issue, message: "Closes nothing")
 
-        merge_merge_requests_closing_issue(issue)
+        merge_merge_requests_closing_issue(user, project, issue)
 
         expect(subject[:code].median).to be_nil
       end
diff --git a/spec/models/cycle_analytics/issue_spec.rb b/spec/models/cycle_analytics/issue_spec.rb
index 985e1bf80be..45f1b4fe8a3 100644
--- a/spec/models/cycle_analytics/issue_spec.rb
+++ b/spec/models/cycle_analytics/issue_spec.rb
@@ -26,8 +26,8 @@ describe 'CycleAnalytics#issue' do
                              end]],
     post_fn: -> (context, data) do
       if data[:issue].persisted?
-        context.create_merge_request_closing_issue(data[:issue].reload)
-        context.merge_merge_requests_closing_issue(data[:issue])
+        context.create_merge_request_closing_issue(context.user, context.project, data[:issue].reload)
+        context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
       end
     end)
 
@@ -37,8 +37,8 @@ describe 'CycleAnalytics#issue' do
       issue = create(:issue, project: project)
       issue.update(label_ids: [regular_label.id])
 
-      create_merge_request_closing_issue(issue)
-      merge_merge_requests_closing_issue(issue)
+      create_merge_request_closing_issue(user, project, issue)
+      merge_merge_requests_closing_issue(user, project, issue)
 
       expect(subject[:issue].median).to be_nil
     end
diff --git a/spec/models/cycle_analytics/plan_spec.rb b/spec/models/cycle_analytics/plan_spec.rb
index 6fbb2a2d102..d366e2b723a 100644
--- a/spec/models/cycle_analytics/plan_spec.rb
+++ b/spec/models/cycle_analytics/plan_spec.rb
@@ -29,8 +29,8 @@ describe 'CycleAnalytics#plan' do
                                context.create_commit_referencing_issue(data[:issue], branch_name: data[:branch_name])
                              end]],
     post_fn: -> (context, data) do
-      context.create_merge_request_closing_issue(data[:issue], source_branch: data[:branch_name])
-      context.merge_merge_requests_closing_issue(data[:issue])
+      context.create_merge_request_closing_issue(context.user, context.project, data[:issue], source_branch: data[:branch_name])
+      context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
     end)
 
   context "when a regular label (instead of a list label) is added to the issue" do
@@ -41,8 +41,8 @@ describe 'CycleAnalytics#plan' do
       issue.update(label_ids: [label.id])
       create_commit_referencing_issue(issue, branch_name: branch_name)
 
-      create_merge_request_closing_issue(issue, source_branch: branch_name)
-      merge_merge_requests_closing_issue(issue)
+      create_merge_request_closing_issue(user, project, issue, source_branch: branch_name)
+      merge_merge_requests_closing_issue(user, project, issue)
 
       expect(subject[:issue].median).to be_nil
     end
diff --git a/spec/models/cycle_analytics/production_spec.rb b/spec/models/cycle_analytics/production_spec.rb
index f8681c0a2f9..156eb96cfce 100644
--- a/spec/models/cycle_analytics/production_spec.rb
+++ b/spec/models/cycle_analytics/production_spec.rb
@@ -13,11 +13,11 @@ describe 'CycleAnalytics#production' do
     data_fn: -> (context) { { issue: context.build(:issue, project: context.project) } },
     start_time_conditions: [["issue is created", -> (context, data) { data[:issue].save }]],
     before_end_fn: lambda do |context, data|
-      context.create_merge_request_closing_issue(data[:issue])
-      context.merge_merge_requests_closing_issue(data[:issue])
+      context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
+      context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
     end,
     end_time_conditions:
-      [["merge request that closes issue is deployed to production", -> (context, data) { context.deploy_master }],
+      [["merge request that closes issue is deployed to production", -> (context, data) { context.deploy_master(context.user, context.project) }],
        ["production deploy happens after merge request is merged (along with other changes)",
         lambda do |context, data|
           # Make other changes on master
@@ -29,14 +29,14 @@ describe 'CycleAnalytics#production' do
             branch_name: 'master')
           context.project.repository.commit(sha)
 
-          context.deploy_master
+          context.deploy_master(context.user, context.project)
         end]])
 
   context "when a regular merge request (that doesn't close the issue) is merged and deployed" do
     it "returns nil" do
       merge_request = create(:merge_request)
       MergeRequests::MergeService.new(project, user).execute(merge_request)
-      deploy_master
+      deploy_master(user, project)
 
       expect(subject[:production].median).to be_nil
     end
@@ -45,9 +45,9 @@ describe 'CycleAnalytics#production' do
   context "when the deployment happens to a non-production environment" do
     it "returns nil" do
       issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(issue)
+      merge_request = create_merge_request_closing_issue(user, project, issue)
       MergeRequests::MergeService.new(project, user).execute(merge_request)
-      deploy_master(environment: 'staging')
+      deploy_master(user, project, environment: 'staging')
 
       expect(subject[:production].median).to be_nil
     end
diff --git a/spec/models/cycle_analytics/review_spec.rb b/spec/models/cycle_analytics/review_spec.rb
index 0ac58695b35..0aedfb49cb5 100644
--- a/spec/models/cycle_analytics/review_spec.rb
+++ b/spec/models/cycle_analytics/review_spec.rb
@@ -13,11 +13,11 @@ describe 'CycleAnalytics#review' do
     data_fn: -> (context) { { issue: context.create(:issue, project: context.project) } },
     start_time_conditions: [["merge request that closes issue is created",
                              -> (context, data) do
-                               context.create_merge_request_closing_issue(data[:issue])
+                               context.create_merge_request_closing_issue(context.user, context.project, data[:issue])
                              end]],
     end_time_conditions:   [["merge request that closes issue is merged",
                              -> (context, data) do
-                               context.merge_merge_requests_closing_issue(data[:issue])
+                               context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
                              end]],
     post_fn: nil)
 
diff --git a/spec/models/cycle_analytics/staging_spec.rb b/spec/models/cycle_analytics/staging_spec.rb
index b66d5623910..0cbda50c688 100644
--- a/spec/models/cycle_analytics/staging_spec.rb
+++ b/spec/models/cycle_analytics/staging_spec.rb
@@ -13,15 +13,15 @@ describe 'CycleAnalytics#staging' do
     phase: :staging,
     data_fn: lambda do |context|
       issue = context.create(:issue, project: context.project)
-      { issue: issue, merge_request: context.create_merge_request_closing_issue(issue) }
+      { issue: issue, merge_request: context.create_merge_request_closing_issue(context.user, context.project, issue) }
     end,
     start_time_conditions: [["merge request that closes issue is merged",
                              -> (context, data) do
-                               context.merge_merge_requests_closing_issue(data[:issue])
+                               context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
                              end]],
     end_time_conditions:   [["merge request that closes issue is deployed to production",
                              -> (context, data) do
-                               context.deploy_master
+                               context.deploy_master(context.user, context.project)
                              end],
                             ["production deploy happens after merge request is merged (along with other changes)",
                              lambda do |context, data|
@@ -34,14 +34,14 @@ describe 'CycleAnalytics#staging' do
                                  branch_name: 'master')
                                context.project.repository.commit(sha)
 
-                               context.deploy_master
+                               context.deploy_master(context.user, context.project)
                              end]])
 
   context "when a regular merge request (that doesn't close the issue) is merged and deployed" do
     it "returns nil" do
       merge_request = create(:merge_request)
       MergeRequests::MergeService.new(project, user).execute(merge_request)
-      deploy_master
+      deploy_master(user, project)
 
       expect(subject[:staging].median).to be_nil
     end
@@ -50,9 +50,9 @@ describe 'CycleAnalytics#staging' do
   context "when the deployment happens to a non-production environment" do
     it "returns nil" do
       issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(issue)
+      merge_request = create_merge_request_closing_issue(user, project, issue)
       MergeRequests::MergeService.new(project, user).execute(merge_request)
-      deploy_master(environment: 'staging')
+      deploy_master(user, project, environment: 'staging')
 
       expect(subject[:staging].median).to be_nil
     end
diff --git a/spec/models/cycle_analytics/test_spec.rb b/spec/models/cycle_analytics/test_spec.rb
index 690c09bc2dc..e58b8fdff58 100644
--- a/spec/models/cycle_analytics/test_spec.rb
+++ b/spec/models/cycle_analytics/test_spec.rb
@@ -12,26 +12,26 @@ describe 'CycleAnalytics#test' do
     phase: :test,
     data_fn: lambda do |context|
       issue = context.create(:issue, project: context.project)
-      merge_request = context.create_merge_request_closing_issue(issue)
+      merge_request = context.create_merge_request_closing_issue(context.user, context.project, issue)
       pipeline = context.create(:ci_pipeline, ref: merge_request.source_branch, sha: merge_request.diff_head_sha, project: context.project, head_pipeline_of: merge_request)
       { pipeline: pipeline, issue: issue }
     end,
     start_time_conditions: [["pipeline is started", -> (context, data) { data[:pipeline].run! }]],
     end_time_conditions:   [["pipeline is finished", -> (context, data) { data[:pipeline].succeed! }]],
     post_fn: -> (context, data) do
-      context.merge_merge_requests_closing_issue(data[:issue])
+      context.merge_merge_requests_closing_issue(context.user, context.project, data[:issue])
     end)
 
   context "when the pipeline is for a regular merge request (that doesn't close an issue)" do
     it "returns nil" do
       issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(issue)
+      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.succeed!
 
-      merge_merge_requests_closing_issue(issue)
+      merge_merge_requests_closing_issue(user, project, issue)
 
       expect(subject[:test].median).to be_nil
     end
@@ -51,13 +51,13 @@ describe 'CycleAnalytics#test' do
   context "when the pipeline is dropped (failed)" do
     it "returns nil" do
       issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(issue)
+      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.drop!
 
-      merge_merge_requests_closing_issue(issue)
+      merge_merge_requests_closing_issue(user, project, issue)
 
       expect(subject[:test].median).to be_nil
     end
@@ -66,13 +66,13 @@ describe 'CycleAnalytics#test' do
   context "when the pipeline is cancelled" do
     it "returns nil" do
       issue = create(:issue, project: project)
-      merge_request = create_merge_request_closing_issue(issue)
+      merge_request = create_merge_request_closing_issue(user, project, issue)
       pipeline = create(:ci_pipeline, ref: "refs/heads/#{merge_request.source_branch}", sha: merge_request.diff_head_sha)
 
       pipeline.run!
       pipeline.cancel!
 
-      merge_merge_requests_closing_issue(issue)
+      merge_merge_requests_closing_issue(user, project, issue)
 
       expect(subject[:test].median).to be_nil
     end
diff --git a/spec/models/cycle_analytics_spec.rb b/spec/models/cycle_analytics_spec.rb
new file mode 100644
index 00000000000..0fe24870f02
--- /dev/null
+++ b/spec/models/cycle_analytics_spec.rb
@@ -0,0 +1,30 @@
+require 'spec_helper'
+
+describe CycleAnalytics do
+  let(:project) { create(:project, :repository) }
+  let(:from_date) { 10.days.ago }
+  let(:user) { create(:user, :admin) }
+  let(:issue) { create(:issue, project: project, created_at: 2.days.ago) }
+  let(:milestone) { create(:milestone, project: project) }
+  let(:mr) { create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}") }
+  let(:pipeline) { create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr) }
+
+  subject { described_class.new(project, from: from_date) }
+
+  describe '#all_medians_per_stage' do
+    before do
+      allow_any_instance_of(Gitlab::ReferenceExtractor).to receive(:issues).and_return([issue])
+
+      create_cycle(user, project, issue, mr, milestone, pipeline)
+      deploy_master(user, project)
+    end
+
+    it 'returns every median for each stage for a specific project' do
+      values = described_class::STAGES.each_with_object({}) do |stage_name, hsh|
+        hsh[stage_name] = subject[stage_name].median.presence
+      end
+
+      expect(subject.all_medians_per_stage).to eq(values)
+    end
+  end
+end
diff --git a/spec/requests/projects/cycle_analytics_events_spec.rb b/spec/requests/projects/cycle_analytics_events_spec.rb
index 98f70e2101b..eef860821e5 100644
--- a/spec/requests/projects/cycle_analytics_events_spec.rb
+++ b/spec/requests/projects/cycle_analytics_events_spec.rb
@@ -15,7 +15,7 @@ describe 'cycle analytics events' do
         end
       end
 
-      deploy_master
+      deploy_master(user, project)
 
       login_as(user)
     end
@@ -119,7 +119,7 @@ describe 'cycle analytics events' do
   def create_cycle
     milestone = create(:milestone, project: project)
     issue.update(milestone: milestone)
-    mr = create_merge_request_closing_issue(issue, commit_message: "References #{issue.to_reference}")
+    mr = create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}")
 
     pipeline = create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr)
     pipeline.run
@@ -127,7 +127,7 @@ describe 'cycle analytics events' do
     create(:ci_build, pipeline: pipeline, status: :success, author: user)
     create(:ci_build, pipeline: pipeline, status: :success, author: user)
 
-    merge_merge_requests_closing_issue(issue)
+    merge_merge_requests_closing_issue(user, project, issue)
 
     ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.to_hash)
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c0f3366fb52..9f6f0204a16 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -186,6 +186,10 @@ RSpec.configure do |config|
     example.run if Gitlab::Database.postgresql?
   end
 
+  config.around(:each, :mysql) do |example|
+    example.run if Gitlab::Database.mysql?
+  end
+
   # This makes sure the `ApplicationController#can?` method is stubbed with the
   # original implementation for all view specs.
   config.before(:each, type: :view) do
diff --git a/spec/support/cycle_analytics_helpers.rb b/spec/support/cycle_analytics_helpers.rb
index d5ef80cfab2..73cc64c0b74 100644
--- a/spec/support/cycle_analytics_helpers.rb
+++ b/spec/support/cycle_analytics_helpers.rb
@@ -26,7 +26,19 @@ module CycleAnalyticsHelpers
                        ref: 'refs/heads/master').execute
   end
 
-  def create_merge_request_closing_issue(issue, message: nil, source_branch: nil, commit_message: 'commit message')
+  def create_cycle(user, project, issue, mr, milestone, pipeline)
+    issue.update(milestone: milestone)
+    pipeline.run
+
+    ci_build = create(:ci_build, pipeline: pipeline, status: :success, author: user)
+
+    merge_merge_requests_closing_issue(user, project, issue)
+    ProcessCommitWorker.new.perform(project.id, user.id, mr.commits.last.to_hash)
+
+    ci_build
+  end
+
+  def create_merge_request_closing_issue(user, project, issue, message: nil, source_branch: nil, commit_message: 'commit message')
     if !source_branch || project.repository.commit(source_branch).blank?
       source_branch = generate(:branch)
       project.repository.add_branch(user, source_branch, 'master')
@@ -52,19 +64,19 @@ module CycleAnalyticsHelpers
     mr
   end
 
-  def merge_merge_requests_closing_issue(issue)
+  def merge_merge_requests_closing_issue(user, project, issue)
     merge_requests = issue.closed_by_merge_requests(user)
 
     merge_requests.each { |merge_request| MergeRequests::MergeService.new(project, user).execute(merge_request) }
   end
 
-  def deploy_master(environment: 'production')
+  def deploy_master(user, project, environment: 'production')
     dummy_job =
       case environment
       when 'production'
-        dummy_production_job
+        dummy_production_job(user, project)
       when 'staging'
-        dummy_staging_job
+        dummy_staging_job(user, project)
       else
         raise ArgumentError
       end
@@ -72,25 +84,24 @@ module CycleAnalyticsHelpers
     CreateDeploymentService.new(dummy_job).execute
   end
 
-  def dummy_production_job
-    @dummy_job ||= new_dummy_job('production')
+  def dummy_production_job(user, project)
+    new_dummy_job(user, project, 'production')
   end
 
-  def dummy_staging_job
-    @dummy_job ||= new_dummy_job('staging')
+  def dummy_staging_job(user, project)
+    new_dummy_job(user, project, 'staging')
   end
 
-  def dummy_pipeline
-    @dummy_pipeline ||=
-      Ci::Pipeline.new(
-        sha: project.repository.commit('master').sha,
-        ref: 'master',
-        source: :push,
-        project: project,
-        protected: false)
+  def dummy_pipeline(project)
+    Ci::Pipeline.new(
+      sha: project.repository.commit('master').sha,
+      ref: 'master',
+      source: :push,
+      project: project,
+      protected: false)
   end
 
-  def new_dummy_job(environment)
+  def new_dummy_job(user, project, environment)
     project.environments.find_or_create_by(name: environment)
 
     Ci::Build.new(
@@ -101,7 +112,7 @@ module CycleAnalyticsHelpers
       tag: false,
       name: 'dummy',
       stage: 'dummy',
-      pipeline: dummy_pipeline,
+      pipeline: dummy_pipeline(project),
       protected: false)
   end