Track epic update note via usage ping

- Add usage ping metrics files

doc/development/usage_ping/dictionary.md

@@ -9884,6 +9884,30 @@ Status: `implemented`
 
 Tiers: `premium`, `ultimate`
 
+### `redis_hll_counters.epics_usage.g_project_management_users_updating_epic_notes_monthly`
+
+Counts of MAU updating epic notes
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_28d/20210314234202_g_project_management_users_updating_epic_notes_monthly.yml)
+
+Group: `group:product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
+### `redis_hll_counters.epics_usage.g_project_management_users_updating_epic_notes_weekly`
+
+Counts of WAU updating epic notes
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_7d/20210314234041_g_project_management_users_updating_epic_notes_weekly.yml)
+
+Group: `group:product planning`
+
+Status: `implemented`
+
+Tiers: `premium`, `ultimate`
+
 ### `redis_hll_counters.ide_edit.g_edit_by_sfe_monthly`
 
 Missing description

ee/app/models/ee/note.rb

@@ -76,6 +76,10 @@ module EE
       for_vulnerability? || super
     end
 
+    def usage_ping_track_updated_epic_note(user)
+      ::Gitlab::UsageDataCounters::EpicActivityUniqueCounter.track_epic_note_updated_action(author: user) if for_epic?
+    end
+
     private
 
     def system_note_for_epic?

ee/app/services/ee/notes/update_service.rb

@@ -13,6 +13,8 @@ module EE
           ::Gitlab::StatusPage.trigger_publish(project, current_user, updated_note)
         end
 
+        note.usage_ping_track_updated_epic_note(current_user) if note.for_epic?
+
         updated_note
       end
     end

ee/changelogs/unreleased/292253-cablett-update-epic-note.yml

+---
+title: Track epic comment updated
+merge_request: 56610
+author:
+type: other

ee/config/metrics/counts_28d/20210314234202_g_project_management_users_updating_epic_notes_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_notes_monthly
+description: Counts of MAU updating epic notes
+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/56610
+time_frame: 28d
+data_source: redis_hll
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/config/metrics/counts_7d/20210314234041_g_project_management_users_updating_epic_notes_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_notes_weekly
+description: Counts of WAU updating epic notes
+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/56610
+time_frame: 7d
+data_source: redis_hll
+distribution:
+- ee
+tier:
+- premium
+- ultimate

ee/lib/gitlab/usage_data_counters/epic_activity_unique_counter.rb

@@ -8,15 +8,20 @@ module Gitlab
       # slot of issue events to allow data aggregation.
       # More information in: https://gitlab.com/gitlab-org/gitlab/-/issues/322405
       EPIC_CREATED = 'g_project_management_epic_created'
+      EPIC_NOTE_UPDATED = 'g_project_management_users_updating_epic_notes'
+      EPIC_NOTE_DESTROYED = 'g_project_management_users_destroying_epic_notes'
       EPIC_START_DATE_SET_AS_FIXED = 'g_project_management_users_setting_epic_start_date_as_fixed'
       EPIC_START_DATE_SET_AS_INHERITED = 'g_project_management_users_setting_epic_start_date_as_inherited'
-      EPIC_NOTE_DESTROYED = 'g_project_management_users_destroying_epic_notes'
 
       class << self
         def track_epic_created_action(author:, time: Time.zone.now)
           track_unique_action(EPIC_CREATED, author, time)
         end
 
+        def track_epic_note_updated_action(author:, time: Time.zone.now)
+          track_unique_action(EPIC_NOTE_UPDATED, author, time)
+        end
+
         def track_epic_note_destroyed_action(author:, time: Time.zone.now)
           track_unique_action(EPIC_NOTE_DESTROYED, author, time)
         end

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

@@ -20,6 +20,18 @@ RSpec.describe Gitlab::UsageDataCounters::EpicActivityUniqueCounter, :clean_gitl
     it_behaves_like 'does not track when feature flag is disabled', :track_epics_activity
   end
 
+  context 'for epic note updated event' do
+    def track_action(params)
+      described_class.track_epic_note_updated_action(**params)
+    end
+
+    it_behaves_like 'a daily tracked issuable event' do
+      let(:action) { described_class::EPIC_NOTE_UPDATED }
+    end
+
+    it_behaves_like 'does not track when feature flag is disabled', :track_epics_activity
+  end
+
   context 'for epic note destroyed event' do
     def track_action(params)
       described_class.track_epic_note_destroyed_action(**params)

ee/spec/services/ee/notes/update_service_spec.rb

@@ -10,11 +10,12 @@ RSpec.describe Notes::UpdateService do
     create(:note_on_issue, project: project, author: user)
   end
 
+  let(:note_text) { 'text' }
+  let(:opts) { { note: note_text } }
+
   subject(:service) { described_class.new(project, user, opts) }
 
   describe '#execute' do
-    let(:opts) { { note: note_text } }
-
     describe 'publish to status page' do
       let(:execute) { service.execute(note) }
       let(:issue_id) { note.noteable_id }
@@ -25,8 +26,6 @@ RSpec.describe Notes::UpdateService do
       end
 
       context 'for text-only update' do
-        let(:note_text) { 'text' }
-
         include_examples 'trigger status page publish'
 
         context 'without recognized emoji' do
@@ -49,4 +48,17 @@ RSpec.describe Notes::UpdateService do
       end
     end
   end
+
+  context 'for epics' do
+    let_it_be(:epic) { create(:epic) }
+    let_it_be(:note) { create(:note, noteable: epic) }
+
+    subject(:service) { described_class.new(nil, user, opts) }
+
+    it 'tracks epic note creation' do
+      expect(::Gitlab::UsageDataCounters::EpicActivityUniqueCounter).to receive(:track_epic_note_updated_action).with(author: user)
+
+      described_class.new(nil, user, opts).execute(note)
+    end
+  end
 end

lib/gitlab/usage_data_counters/known_events/epic_events.yml

@@ -9,6 +9,12 @@
   aggregation: daily
   feature_flag: track_epics_activity
 
+- name: g_project_management_users_updating_epic_notes
+  category: epics_usage
+  redis_slot: project_management
+  aggregation: daily
+  feature_flag: track_epics_activity
+
 - name: g_project_management_users_destroying_epic_notes
   category: epics_usage
   redis_slot: project_management