Add metric for users associating group milestones to releases

Changelog: added

app/models/release.rb

@@ -34,6 +34,7 @@ class Release < ApplicationRecord
              project: [:project_feature, :route, { namespace: :route }])
   }
   scope :with_milestones, -> { joins(:milestone_releases) }
+  scope :with_group_milestones, -> { joins(:milestones).where.not(milestones: { group_id: nil }) }
   scope :recent, -> { sorted.limit(MAX_NUMBER_TO_DISPLAY) }
   scope :without_evidence, -> { left_joins(:evidences).where(::Releases::Evidence.arel_table[:id].eq(nil)) }
   scope :released_within_2hrs, -> { where(released_at: Time.zone.now - 1.hour..Time.zone.now + 1.hour) }

ee/config/metrics/counts_28d/20211008142339_releases_with_group_milestones.yml

+---
+key_path: usage_activity_by_stage_monthly.release.releases_with_group_milestones
+description: Unique users creating releases with group milestones associated
+product_section: ops
+product_stage: release
+product_group: 'group::release'
+product_category: Release Orchestration
+value_type: number
+status: active
+milestone: "14.4"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/71650
+time_frame: 28d
+data_source: database
+instrumentation_class: 'CountUsersAssociatingGroupMilestonesToReleasesMetric'
+data_category: optional
+performance_indicator_type: 
+- smau
+distribution:
+  - ee
+tier:
+  - premium
+  - ultimate

ee/config/metrics/counts_all/20211007133842_releases_with_group_milestones.yml

+---
+key_path: usage_activity_by_stage.release.releases_with_group_milestones
+description: Unique users creating releases with group milestones associated
+product_section: ops
+product_stage: release
+product_group: 'group::release'
+product_category: Release Orchestration
+value_type: number
+status: active
+milestone: "14.4"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/71650
+time_frame: all
+data_source: database
+instrumentation_class: 'CountUsersAssociatingGroupMilestonesToReleasesMetric'
+data_category: optional
+performance_indicator_type: []
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/lib/ee/gitlab/usage_data.rb

@@ -344,8 +344,10 @@ module EE
         # Omitted because no user, creator or author associated: `environments`, `feature_flags`, `in_review_folder`, `pages_domains`
         override :usage_activity_by_stage_release
         def usage_activity_by_stage_release(time_period)
+          time_frame = metric_time_period(time_period)
           super.merge({
-            projects_mirrored_with_pipelines_enabled: distinct_count(::Project.mirrored_with_enabled_pipelines.where(time_period), :creator_id)
+            projects_mirrored_with_pipelines_enabled: distinct_count(::Project.mirrored_with_enabled_pipelines.where(time_period), :creator_id),
+            releases_with_group_milestones: add_metric('CountUsersAssociatingGroupMilestonesToReleasesMetric', time_frame: time_frame)
           })
         end
 

ee/lib/gitlab/usage/metrics/instrumentations/count_users_associating_group_milestones_to_releases_metric.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Usage
+    module Metrics
+      module Instrumentations
+        class CountUsersAssociatingGroupMilestonesToReleasesMetric < DatabaseMetric
+          operation :distinct_count, column: :author_id
+
+          relation { Release.with_group_milestones }
+
+          start { Release.minimum(:author_id) }
+          finish { Release.maximum(:author_id) }
+        end
+      end
+    end
+  end
+end

ee/spec/lib/ee/gitlab/usage_data_spec.rb

@@ -542,15 +542,23 @@ RSpec.describe Gitlab::UsageData do
 
   describe 'usage_activity_by_stage_release' do
     it 'includes accurate usage_activity_by_stage data' do
+      stub_licensed_features(group_milestone_project_releases: true)
+      group_milestone = create(:milestone, :on_group)
+      project = create(:project, group: group_milestone.group)
+
       for_defined_days_back do
         create(:project, :mirror, mirror_trigger_builds: true)
+
+        create(:release, created_at: 3.days.ago, project: project, milestones: [group_milestone])
       end
 
       expect(described_class.usage_activity_by_stage_release({})).to include(
-        projects_mirrored_with_pipelines_enabled: 2
+        projects_mirrored_with_pipelines_enabled: 2,
+        releases_with_group_milestones: 2
       )
       expect(described_class.usage_activity_by_stage_release(described_class.monthly_time_range_db_params)).to include(
-        projects_mirrored_with_pipelines_enabled: 1
+        projects_mirrored_with_pipelines_enabled: 1,
+        releases_with_group_milestones: 1
       )
     end
   end

ee/spec/lib/gitlab/usage/metrics/instrumentations/count_users_associating_group_milestones_to_releases_metric_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Usage::Metrics::Instrumentations::CountUsersAssociatingGroupMilestonesToReleasesMetric do
+  before do
+    stub_licensed_features(group_milestone_project_releases: true)
+  end
+
+  let(:group_milestone) { create(:milestone, :on_group) }
+  let(:project) { create(:project, group: group_milestone.group) }
+  let!(:release) { create(:release, created_at: 3.days.ago) }
+  let!(:release_with_milestone) { create(:release, :with_milestones, created_at: 3.days.ago) }
+  let!(:release_with_group_milestone) { create(:release, created_at: 3.days.ago, project: project, milestones: [group_milestone]) }
+
+  it_behaves_like 'a correct instrumented metric value', { time_frame: '28d', data_source: 'database' } do
+    let(:expected_value) { 1 }
+  end
+end