title: Control/Intercept Load Balancer traffic using Istio
body: <p>I want to control/intercept the load balancer traffic using Istio. Istio gives you the ability to add a mixer on a service level but I want to add some code on a higher level just before the request traffic rules get executed. 
  Thus instead of adding actions per service I want to have some actions executed just after the request was received from the load balancer.</p>