Add a Redis connection pool.
user
```ruby
require 'connection_pool'
require 'redis'
require 'metriks'
 
class RedisPool
  def initialize(options)
    @options = options.delete(:pool)
    @options[:size] ||= 10
    @options[:timeout] ||= 10
    @pool = ConnectionPool.new(options) do
      ::Redis.new(options)
    end
  end
 
  def method_missing(name, *args)
    timer = Metriks.timer('redis.pool.wait')
    timer.time
    @pool.with do |redis|
      timer.stop
      if redis.respond_to?(name)
        Metriks.timer("redis.operations").time do
          redis.send(name, *args)
        end
      else
        super
      end
    end
  end
end
```
assistant