Change Redis key format for unique visits

lib/gitlab/analytics/unique_visits.rb

@@ -43,9 +43,7 @@ module Gitlab
         keys = TARGET_IDS.map { |target_id| key(target_id, week_of) }
 
         Gitlab::Redis::SharedState.with do |redis|
-          Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
-            redis.pfcount(*keys)
-          end
+          redis.pfcount(*keys)
         end
       end
 
@@ -55,7 +53,7 @@ module Gitlab
         raise "Invalid target id #{target_id}" unless TARGET_IDS.include?(target_id.to_s)
 
         year_week = time.strftime('%G-%V')
-        "#{target_id}-#{year_week}"
+        "#{target_id}-{#{year_week}}"
       end
     end
   end