Add retention policy for cached content and media (#19232)

app/lib/redis_configuration.rb

@@ -7,9 +7,7 @@ class RedisConfiguration
       @pool = ConnectionPool.new(size: new_pool_size) { new.connection }
     end
 
-    def with
-      pool.with { |redis| yield redis }
-    end
+    delegate :with, to: :pool
 
     def pool
       @pool ||= establish_pool(pool_size)
@@ -17,7 +15,7 @@ class RedisConfiguration
 
     def pool_size
       if Sidekiq.server?
-        Sidekiq.options[:concurrency]
+        Sidekiq[:concurrency]
       else
         ENV['MAX_THREADS'] || 5
       end