Could you add a 4th (maybe even smaller) server, and configure your load balancer to only route 5% of traffic to this server? We have the same problem, conti

Could you add a 4th (maybe even smaller) server, and configure your load balancer to only route 5% of traffic to this server? We have the same problem, continuously enough requests to implement a system like this, but we only run on a small number of production servers. We've recently added a canary server into the pool, which does increase costs a little, but we made it a small instance, and route only a small amount of traffic to it.