Track epic parent changes via usage ping

- add dictionary update
- add tests

Changelog: other

doc/development/usage_ping/dictionary.md

@@ -10280,6 +10280,30 @@ Status: `implemented`
 
 Tiers: `premium`, `ultimate`
 
+### `redis_hll_counters.epics_usage.g_project_management_users_updating_epic_parent_monthly`
+
+Counts of MAU updating parent on epic
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_28d/20210423011841_g_project_management_users_updating_epic_parent_monthly.yml)
+
+Group: `group::product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
+### `redis_hll_counters.epics_usage.g_project_management_users_updating_epic_parent_weekly`
+
+Counts of WAU updating parent on epic
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_7d/20210423012053_g_project_management_users_updating_epic_parent_weekly.yml)
+
+Group: `group::product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
 ### `redis_hll_counters.epics_usage.g_project_management_users_updating_epic_titles_monthly`
 
 Counts of MAU changing epic titles

ee/app/services/epics/base_service.rb

@@ -29,13 +29,25 @@ module Epics
     def assign_parent_epic_for(epic)
       return unless parent_epic
 
-      EpicLinks::CreateService.new(parent_epic, current_user, { target_issuable: epic }).execute
+      result = EpicLinks::CreateService.new(parent_epic, current_user, { target_issuable: epic }).execute
+
+      unless result[:status] == :error
+        track_epic_parent_updated
+      end
+
+      result
     end
 
     def assign_child_epic_for(epic)
       return unless child_epic
 
-      EpicLinks::CreateService.new(epic, current_user, { target_issuable: child_epic }).execute
+      result = EpicLinks::CreateService.new(epic, current_user, { target_issuable: child_epic }).execute
+
+      unless result[:status] == :error
+        track_epic_parent_updated
+      end
+
+      result
     end
 
     def available_labels
@@ -58,5 +70,9 @@ module Epics
     def reopen_service
       Epics::ReopenService
     end
+
+    def track_epic_parent_updated
+      ::Gitlab::UsageDataCounters::EpicActivityUniqueCounter.track_epic_parent_updated_action(author: current_user)
+    end
   end
 end

ee/changelogs/unreleased/292253-track-epic-set-parent.yml

+---
+title: Track epic parent changes via usage ping
+merge_request: 60079
+author:
+type: other

ee/config/metrics/counts_28d/20210423011841_g_project_management_users_updating_epic_parent_monthly.yml

+---
+# Name of this metric contains g_project_management prefix
+# because we are using the same slot from issue_tracking to
+# allow data aggregation.
+key_path: redis_hll_counters.epics_usage.g_project_management_users_updating_epic_parent_monthly
+description: Counts of MAU updating parent on epic
+product_section: dev
+product_stage: plan
+product_group: group::product planning
+product_category: epics_usage
+value_type: number
+status: implemented
+milestone: "13.12"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60079
+time_frame: 28d
+data_source: redis_hll
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/config/metrics/counts_7d/20210423012053_g_project_management_users_updating_epic_parent_weekly.yml

+---
+# Name of this metric contains g_project_management prefix
+# because we are using the same slot from issue_tracking to
+# allow data aggregation.
+key_path: redis_hll_counters.epics_usage.g_project_management_users_updating_epic_parent_weekly
+description: Counts of WAU updating parent on epic
+product_section: dev
+product_stage: plan
+product_group: group::product planning
+product_category: epics_usage
+value_type: number
+status: implemented
+milestone: "13.12"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60079
+time_frame: 7d
+data_source: redis_hll
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/lib/gitlab/usage_data_counters/epic_activity_unique_counter.rb

@@ -22,6 +22,7 @@ module Gitlab
       EPIC_ISSUE_ADDED = 'g_project_management_epic_issue_added'
       EPIC_ISSUE_REMOVED = 'g_project_management_epic_issue_removed'
       EPIC_ISSUE_MOVED_FROM_PROJECT = 'g_project_management_epic_issue_moved_from_project'
+      EPIC_PARENT_UPDATED = 'g_project_management_users_updating_epic_parent'
       EPIC_CLOSED = 'g_project_management_epic_closed'
       EPIC_REOPENED = 'g_project_management_epic_reopened'
       ISSUE_PROMOTED_TO_EPIC = 'g_project_management_issue_promoted_to_epic'
@@ -91,6 +92,10 @@ module Gitlab
           track_unique_action(EPIC_ISSUE_MOVED_FROM_PROJECT, author)
         end
 
+        def track_epic_parent_updated_action(author:)
+          track_unique_action(EPIC_PARENT_UPDATED, author)
+        end
+
         def track_epic_closed_action(author:)
           track_unique_action(EPIC_CLOSED, author)
         end

ee/spec/lib/gitlab/usage_data_counters/epic_activity_unique_counter_spec.rb

@@ -246,6 +246,18 @@ RSpec.describe Gitlab::UsageDataCounters::EpicActivityUniqueCounter, :clean_gitl
     it_behaves_like 'does not track when feature flag is disabled', :track_epics_activity
   end
 
+  context 'updating epic parent' do
+    def track_action(params)
+      described_class.track_epic_parent_updated_action(**params)
+    end
+
+    it_behaves_like 'a daily tracked issuable event' do
+      let(:action) { described_class::EPIC_PARENT_UPDATED }
+    end
+
+    it_behaves_like 'does not track when feature flag is disabled', :track_epics_activity
+  end
+
   context 'for promoting issue to epic' do
     def track_action(params)
       described_class.track_issue_promoted_to_epic(**params)

ee/spec/services/epics/update_service_spec.rb

@@ -447,6 +447,7 @@ RSpec.describe Epics::UpdateService do
       context 'for /parent_epic' do
         it 'assigns parent epic' do
           parent_epic = create(:epic, group: epic.group)
+          expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).to receive(:track_epic_parent_updated_action)
 
           update_epic(description: "/parent_epic #{parent_epic.to_reference}")
 
@@ -457,6 +458,7 @@ RSpec.describe Epics::UpdateService do
           it 'does not update parent epic' do
             other_group = create(:group, :private)
             parent_epic = create(:epic, group: other_group)
+            expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).not_to receive(:track_epic_parent_updated_action)
 
             update_epic(description: "/parent_epic #{parent_epic.to_reference(group)}")
 
@@ -468,6 +470,7 @@ RSpec.describe Epics::UpdateService do
       context 'for /child_epic' do
         it 'sets a child epic' do
           child_epic = create(:epic, group: group)
+          expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).to receive(:track_epic_parent_updated_action)
 
           update_epic(description: "/child_epic #{child_epic.to_reference}")
 
@@ -478,6 +481,7 @@ RSpec.describe Epics::UpdateService do
           it 'does not set child epic' do
             other_group = create(:group, :private)
             child_epic = create(:epic, group: other_group)
+            expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).not_to receive(:track_epic_parent_updated_action)
 
             update_epic(description: "/child_epic #{child_epic.to_reference(group)}")
             expect(epic.reload.children).to be_empty

lib/gitlab/usage_data_counters/known_events/epic_events.yml

@@ -81,6 +81,8 @@
   aggregation: daily
   feature_flag: track_epics_activity
 
+# relationships
+
 - name: g_project_management_epic_issue_added
   category: epics_usage
   redis_slot: project_management
@@ -99,6 +101,12 @@
   aggregation: daily
   feature_flag: track_epics_activity
 
+- name: g_project_management_users_updating_epic_parent
+  category: epics_usage
+  redis_slot: project_management
+  aggregation: daily
+  feature_flag: track_epics_activity
+
 - name: g_project_management_epic_closed
   category: epics_usage
   redis_slot: project_management