For sure putting another complex system in front of any sort of traffic routing increases the failure modes, but the article makes a nod towards "signal quality

For sure putting another complex system in front of any sort of traffic routing increases the failure modes, but the article makes a nod towards "signal quality" as the metric for traffic shifting. > Failure probabilities were obtained by checking the signal quality of every link every 15 minutes. If the signal quality ever dipped below a receiving threshold, they considered that a link failure. If the signal quality could be a higher level construct (Layer 7 errors), this could route around bad config pushes if they are constrained. I'm not going to pretend that this is definitely feasible, but at least that was my first thought.