Remove time frame constraint from name suggestion

Time frame attribute is captured within other attributes and
shouldn't be repeated inside name

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

@@ -48,6 +48,10 @@ module Gitlab
             end
 
             def name_suggestion(relation:, column: nil, prefix: nil, distinct: nil)
+              # rubocop: disable CodeReuse/ActiveRecord
+              relation = relation.unscope(where: :created_at)
+              # rubocop: enable CodeReuse/ActiveRecord
+
               parts = [prefix]
               arel_column = arelize_column(relation, column)
 

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

@@ -60,6 +60,15 @@ RSpec.describe Gitlab::Usage::Metrics::NamesSuggestions::Generator do
       end
     end
 
+    context 'strips off time period constraint' do
+      it_behaves_like 'name suggestion' do
+        # corresponding metric is collected with distinct_count(::Clusters::Cluster.aws_installed.enabled.where(time_period), :user_id)
+        let(:key_path) { 'usage_activity_by_stage_monthly.configure.clusters_platforms_eks' }
+        let(:constraints) { /<adjective describing\: '\(clusters.provider_type = \d+ AND \("cluster_providers_aws"\."status" IN \(\d+\)\) AND clusters\.enabled = TRUE\)'>/ }
+        let(:name_suggestion) { /count_distinct_user_id_from_#{constraints}_clusters_<with>_#{constraints}_cluster_providers_aws/ }
+      end
+    end
+
     context 'for sum metrics' do
       it_behaves_like 'name suggestion' do
         # corresponding metric is collected with sum(JiraImportState.finished, :imported_issues_count)