Nighthawk is growing in popularity, but the core project only builds to one architecture / one Docker image. Recently, Nighthawk is being improved so that it can be horizontally scalable - such that multiple instances will be cognizant of one another and able to coordinate amongst each other. Nighthawk is a subproject of Envoy. Nighthawk is growing in popularity with Google, Red Hat, and AWS are investing into it. Istio is considering switching from Fortio to Nighthawk.