Track epic promoted action

Record issue promoted to epic on usage ping
Redis HLL

doc/development/usage_ping/dictionary.md

@@ -9908,6 +9908,30 @@ Status: `implemented`
 
 Tiers: `premium`, `ultimate`
 
+### `redis_hll_counters.epics_usage.g_project_management_issue_promoted_to_epic_monthly`
+
+Count of MAU promoting issues to epics
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_28d/20210331193236_g_project_management_issue_promoted_to_epic_monthly.yml)
+
+Group: `group::product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
+### `redis_hll_counters.epics_usage.g_project_management_issue_promoted_to_epic_weekly`
+
+Counts of WAU promoting issues to epics
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_7d/20210331192332_g_project_management_issue_promoted_to_epic_weekly.yml)
+
+Group: `group::product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
 ### `redis_hll_counters.epics_usage.g_project_management_users_creating_epic_notes_monthly`
 
 Counts of MAU adding epic notes

ee/app/services/epics/issue_promote_service.rb

@@ -34,6 +34,8 @@ module Epics
     def track_event
       ::Gitlab::Tracking.event('epics', 'promote', property: 'issue_id', value: original_entity.id,
                                project: issue.project, user: current_user, namespace: @parent_group)
+
+      ::Gitlab::UsageDataCounters::EpicActivityUniqueCounter.track_issue_promoted_to_epic(author: current_user)
     end
 
     def create_new_entity

ee/config/metrics/counts_28d/20210331193236_g_project_management_issue_promoted_to_epic_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_issue_promoted_to_epic_monthly
+description: Count of MAU promoting issues to epics
+product_section: dev
+product_stage: plan
+product_group: group::product planning
+product_category: epics_usage
+value_type: number
+status: implemented
+milestone: "13.11"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56706
+time_frame: 28d
+data_source: redis_hll
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/config/metrics/counts_7d/20210331192332_g_project_management_issue_promoted_to_epic_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_issue_promoted_to_epic_weekly
+description: Counts of WAU promoting issues to epics
+product_section: dev
+product_stage: plan
+product_group: group::product planning
+product_category: epics_usage
+value_type: number
+status: implemented
+milestone: "13.11"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56706
+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_CLOSED = 'g_project_management_epic_closed'
       EPIC_REOPENED = 'g_project_management_epic_reopened'
+      ISSUE_PROMOTED_TO_EPIC = 'g_project_management_issue_promoted_to_epic'
 
       class << self
         def track_epic_created_action(author:)
@@ -84,6 +85,10 @@ module Gitlab
           track_unique_action(EPIC_REOPENED, author)
         end
 
+        def track_issue_promoted_to_epic(author:)
+          track_unique_action(ISSUE_PROMOTED_TO_EPIC, author)
+        end
+
         private
 
         def track_unique_action(action, author)

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

@@ -187,4 +187,16 @@ RSpec.describe Gitlab::UsageDataCounters::EpicActivityUniqueCounter, :clean_gitl
 
     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)
+    end
+
+    it_behaves_like 'a daily tracked issuable event' do
+      let(:action) { described_class::ISSUE_PROMOTED_TO_EPIC }
+    end
+
+    it_behaves_like 'does not track when feature flag is disabled', :track_epics_activity
+  end
 end

ee/spec/services/epics/issue_promote_service_spec.rb

@@ -57,6 +57,13 @@ RSpec.describe Epics::IssuePromoteService, :aggregate_failures do
           end
         end
 
+        it 'counts a usage ping event' do
+          expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).to receive(:track_issue_promoted_to_epic)
+            .with(author: user)
+
+          subject.execute(issue)
+        end
+
         context 'when promoting issue', :snowplow do
           let!(:issue_mentionable_note) { create(:note, noteable: issue, author: user, project: project, note: "note with mention #{user.to_reference}") }
           let!(:issue_note) { create(:note, noteable: issue, author: user, project: project, note: "note without mention") }

lib/gitlab/usage_data_counters/known_events/epic_events.yml

@@ -98,3 +98,9 @@
   redis_slot: project_management
   aggregation: daily
   feature_flag: track_epics_activity
+
+- name: 'g_project_management_issue_promoted_to_epic'
+  category: epics_usage
+  redis_slot: project_management
+  aggregation: daily
+  feature_flag: track_epics_activity