Websockets transition during graceful reload

My problem is that I use websockets with stick-tables and need to periodically update the configuration using external tool. As I understand this process, I will have several PIDs while connections are established, but this doesn’t work as described. Each time I reload the configuration, websocket connection is being dropped.

Reload command:

kill -USR2 `cat /etc/haproxy/haproxy.pid`

Configuration snippet:

global
  pidfile /etc/haproxy/haproxy.pid
  master-worker
  mworker-max-reloads 20
  log stdout local0
  maxconn 500000
  stats socket /var/run/haproxy.sock mode 660 level admin
  stats timeout 30s
  nbproc 1
  nbthread 2
  cpu-map auto:1/1-2 0-1

defaults
  mode http
  log global
  timeout connect 5s
  timeout client 10s
  timeout server 60s
  timeout client-fin 1s
  timeout server-fin 1s
  timeout http-request 10s
  timeout http-keep-alive 300s

  option httplog
  option redispatch
  option dontlognull
  option forwardfor

peers local
  peer haproxy haproxy:1024

frontend stats
  bind :32600
  option http-use-htx
  option dontlog-normal
  http-request use-service prometheus-exporter if { path /metrics }
  stats enable
  stats uri /
  stats refresh 20s

frontend https-in
  bind *:8433 accept-proxy
  mode http

  # Define hosts
  acl host hdr(host) -i doman.com

  ## figure out which one to use
  use_backend servers if host

frontend http-in
  bind :8080 accept-proxy
  mode http
  redirect scheme https code 301 if !{ ssl_fc }

backend servers
  http-request set-header X-Real-IP %[src];
  http-request set-header X-Forwarded-For %[src];
  http-request set-header X-Forwarded-Proto %[src];
  http-request set-header Connection "upgrade"
  http-request set-header Host %[src]

  balance leastconn
  stick-table type string len 80 size 1m expire 8h peers local
  stick on url_param(mrid)

  timeout server  120s
  server1 adress1
  server2 adress2
  ...

Can you help to find if there are another way of graceful termination? Or maybe any thoughts on this topic?

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