There's no `preStop` hook in current router pod, which means haproxy process will receive a `SIGTERM` right after OCP tries terminate it and after a 45 second wait. , the router pod finish termination. 

But, according to HAProxy's document. Sending `SIGTERM` to haproxy process is a hard stop.

So, we should send `SIGUSR1` instead.

Here's a preStop hook example to send `SIGUSR1` to haproxy process.

      preStop:
        exec:
          command: ["/bin/sh", "-c", "kill -SIGUSR1 $(cat /var/lib/haproxy/run/haproxy.pid)"]

Also, please consider allow user to define global grace option in haproxy. Because it is a important option in haproxy soft shutdown. 

https://github.com/kaspergrubbe/haproxy-grace-test