Merge branch 'memoise-database-load-balancing-enabled-check' into 'master'

Memoise database load balancing status

Closes #218966

See merge request gitlab-org/gitlab!32964

ee/lib/ee/gitlab/metrics/samplers/database_sampler.rb

@@ -5,8 +5,12 @@ module EE
     module Metrics
       module Samplers
         module DatabaseSampler
+          extend ::Gitlab::Utils::Override
+          include ::Gitlab::Utils::StrongMemoize
+
           private
 
+          override :host_stats
           def host_stats
             super
               .concat(geo_connection_stats)
@@ -20,7 +24,7 @@ module EE
           end
 
           def load_balancing_connection_stats
-            return [] unless ::Gitlab::Database::LoadBalancing.enable?
+            return [] unless load_balancing_enabled?
 
             ActiveRecord::Base.connection.load_balancer.host_list.hosts.map do |host|
               {
@@ -29,6 +33,12 @@ module EE
               }
             end
           end
+
+          def load_balancing_enabled?
+            strong_memoize(:load_balancing_enabled) do
+              ::Gitlab::Database::LoadBalancing.enable?
+            end
+          end
         end
       end
     end