Add MAU counter for snippet show action

In this commit we add the logic to track the snippets
show action

app/controllers/concerns/snippets_actions.rb

@@ -9,11 +9,14 @@ module SnippetsActions
   include Gitlab::NoteableMetadata
   include Snippets::SendBlob
   include SnippetsSort
+  include RedisTracking
 
   included do
     skip_before_action :verify_authenticity_token,
       if: -> { action_name == 'show' && js_request? }
 
+    track_redis_hll_event :show, name: 'i_snippets_show', feature: :usage_data_i_snippets_show, feature_default_enabled: false
+
     respond_to :html
   end
 

config/feature_flags/development/usage_data_i_snippets_show.yml

+---
+name: usage_data_i_snippets_show
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48113
+rollout_issue_url:
+milestone: '13.7'
+type: development
+group: group::editor
+default_enabled: false

lib/gitlab/usage_data_counters/known_events/common.yml

@@ -408,3 +408,8 @@
   redis_slot: ci_secrets_management
   aggregation: weekly
   feature_flag: usage_data_i_ci_secrets_management_vault_build_created
+- name: i_snippets_show
+  category: snippets
+  redis_slot: snippets
+  aggregation: weekly
+  feature_flag: usage_data_i_snippets_show

spec/controllers/snippets_controller_spec.rb

@@ -172,6 +172,13 @@ RSpec.describe SnippetsController do
           expect(assigns(:snippet)).to eq(public_snippet)
           expect(response).to have_gitlab_http_status(:ok)
         end
+
+        it_behaves_like 'tracking unique hll events', :usage_data_i_snippets_show do
+          subject(:request) { get :show, params: { id: public_snippet.to_param } }
+
+          let(:target_id) { 'i_snippets_show' }
+          let(:expected_type) { instance_of(String) }
+        end
       end
 
       context 'when not signed in' do

spec/lib/gitlab/usage_data_counters/hll_redis_counter_spec.rb

@@ -44,7 +44,8 @@ RSpec.describe Gitlab::UsageDataCounters::HLLRedisCounter, :clean_gitlab_redis_s
         'golang_packages',
         'debian_packages',
         'container_packages',
-        'tag_packages'
+        'tag_packages',
+        'snippets'
       )
     end
   end

spec/lib/gitlab/usage_data_spec.rb

@@ -1235,7 +1235,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
     subject { described_class.redis_hll_counters }
 
     let(:categories) { ::Gitlab::UsageDataCounters::HLLRedisCounter.categories }
-    let(:ineligible_total_categories) { %w[source_code testing ci_secrets_management incident_management_alerts] }
+    let(:ineligible_total_categories) { %w[source_code testing ci_secrets_management incident_management_alerts snippets] }
 
     it 'has all known_events' do
       expect(subject).to have_key(:redis_hll_counters)