I would like to use Envoy to load balance long lived TCP connections under the following setup:
Say, I have 2 machines m1 and m2. I would like all traffic to go to m1. The traffic should go to m2 only if m1 fails (either active/passive healthcheck) Or if it exceeds certain number of connections defined per host.

This is similar to the "first" load balancer in HAProxy: https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#balance