Change name suggestion for redis events

Expande name suggestion prompt for redis with suggested format

lib/gitlab/usage/metrics/names_suggestions/generator.rb

@@ -6,6 +6,7 @@ module Gitlab
       module NamesSuggestions
         class Generator < ::Gitlab::UsageData
           FREE_TEXT_METRIC_NAME = "<please fill metric name>"
+          REDIS_EVENT_METRIC_NAME = "<please fill metric name, suggested format is: who_is_doing_what eg: users_creating_epics>"
           CONSTRAINTS_PROMPT_TEMPLATE = "<adjective describing: '%{constraints}'>"
 
           class << self
@@ -24,7 +25,7 @@ module Gitlab
             end
 
             def redis_usage_counter
-              FREE_TEXT_METRIC_NAME
+              REDIS_EVENT_METRIC_NAME
             end
 
             def alt_usage_data(*)
@@ -32,7 +33,7 @@ module Gitlab
             end
 
             def redis_usage_data_totals(counter)
-              counter.fallback_totals.transform_values { |_| FREE_TEXT_METRIC_NAME}
+              counter.fallback_totals.transform_values { |_| REDIS_EVENT_METRIC_NAME }
             end
 
             def sum(relation, column, *rest)

spec/lib/gitlab/usage/metrics/names_suggestions/generator_spec.rb

@@ -89,7 +89,7 @@ RSpec.describe Gitlab::Usage::Metrics::NamesSuggestions::Generator do
       it_behaves_like 'name suggestion' do
         # corresponding metric is collected with redis_usage_data { unique_visit_service.unique_visits_for(targets: :analytics) }
         let(:key_path) { 'analytics_unique_visits.analytics_unique_visits_for_any_target' }
-        let(:name_suggestion) { /<please fill metric name>/ }
+        let(:name_suggestion) { /<please fill metric name, suggested format is: who_is_doing_what eg: users_creating_epics>/ }
       end
     end