Support multiple HLL redis counter files

Move events file to specific folder
to support future additional files

lib/gitlab/usage_data_counters/hll_redis_counter.rb

@@ -15,9 +15,9 @@ module Gitlab
       CategoryMismatch = Class.new(EventError)
       UnknownAggregationOperator = Class.new(EventError)
 
-      KNOWN_EVENTS_PATH = 'lib/gitlab/usage_data_counters/known_events.yml'
+      KNOWN_EVENTS_PATH = 'lib/gitlab/usage_data_counters/known_events/*.yml'
       ALLOWED_AGGREGATIONS = %i(daily weekly).freeze
-      AGGREGATED_METRICS_PATH = 'lib/gitlab/usage_data_counters/aggregated_metrics.yml'
+      AGGREGATED_METRICS_PATH = 'lib/gitlab/usage_data_counters/aggregated_metrics/*.yml'
       ALLOWED_METRICS_AGGREGATIONS = %w[ANY].freeze
 
       # Track event on entity_id
@@ -102,6 +102,14 @@ module Gitlab
           end
         end
 
+        def known_events
+          @known_events ||= load_events(KNOWN_EVENTS_PATH)
+        end
+
+        def aggregated_metrics
+          @aggregated_metrics ||= load_events(AGGREGATED_METRICS_PATH)
+        end
+
         private
 
         def calculate_count_for_aggregation(aggregation, start_date:, end_date:)
@@ -141,12 +149,10 @@ module Gitlab
           end
         end
 
-        def known_events
-          @known_events ||= load_yaml_from_path(KNOWN_EVENTS_PATH)
-        end
-
-        def aggregated_metrics
-          @aggregated_metrics ||= (load_yaml_from_path(AGGREGATED_METRICS_PATH) || [])
+        def load_events(wildcard)
+          Dir[wildcard].each_with_object([]) do |path, events|
+            events.push(*load_yaml_from_path(path))
+          end
         end
 
         def load_yaml_from_path(path)

spec/lib/gitlab/usage_data_counters/aggregated_metrics_spec.rb

@@ -14,12 +14,10 @@ RSpec.describe 'aggregated metrics' do
   end
 
   let_it_be(:known_events) do
-    YAML.load_file(
-      Rails.root.join(Gitlab::UsageDataCounters::HLLRedisCounter::KNOWN_EVENTS_PATH)
-    ).map(&:with_indifferent_access)
+    Gitlab::UsageDataCounters::HLLRedisCounter.known_events
   end
 
-  YAML.load_file(Rails.root.join(Gitlab::UsageDataCounters::HLLRedisCounter::AGGREGATED_METRICS_PATH))&.map(&:with_indifferent_access).tap do |aggregated_metrics|
+  Gitlab::UsageDataCounters::HLLRedisCounter.aggregated_metrics.tap do |aggregated_metrics|
     it 'all events has unique name' do
       event_names = aggregated_metrics&.map { |event| event[:name] }