A colorful custom error pages server for use with the NGINX ingress controller for Kubernetes.
Penalty Flag is a custom error page server derived from the upstream example within the Kubernetes NGINX Ingress repository.
The idea is that, in the same way that the color of a referee's flag bears meaning for particpants and spectators of a football game, this custom error server provides more colorful (and generally useful) "flags" when something goes wrong with a request processed by ingress.