At high frequency of restarts (250ms), Envoy restart protocol seems to hit a race condition and takes down both child and parent proxies. See https://gist.github.com/kyessenov/0e446c8c0e838c9bedfdf5bc70af5fa8. Here we have 3 epochs, epoch 1 and epoch 2 hit a communication failure and both crashed. Epoch 0 exited gracefully.