"server pod:web-server-rc-6dwzt:service-unsecure:http:10.42.0.13:8080 10.42.0.13:8080 cookie 654bccaf8ef4db9d1848224346d33514 weight 1"    

4.18    

    100%

1. create pod, service and a route
% oc get route
NAME               HOST                                        ADMITTED   SERVICE            TLS
service-unsecure   service-unsecure-default.apps.example.com   True       service-unsecure   
% oc get ep
NAME               ENDPOINTS         AGE
kubernetes         10.44.0.0:6443    19h
service-secure     10.42.0.13:8443   15h
service-unsecure   10.42.0.13:8080   15h     

2. rsh to the router pod, and check the backend server pod's configuration, it has not the "check inter 5000ms" configuration.
% oc -n openshift-ingress rsh router-default-7c64f4b496-94d4s
sh-5.1$ cat haproxy.config | grep -A20 "backend be_http:default:service-unsecure"
backend be_http:default:service-unsecure
  mode http
  option redispatch
  option forwardfor
  balance random


  timeout check 5000ms
  http-request add-header X-Forwarded-Host %[req.hdr(host)]
  http-request add-header X-Forwarded-Port %[dst_port]
  http-request add-header X-Forwarded-Proto http if !{ ssl_fc }
  http-request add-header X-Forwarded-Proto https if { ssl_fc }
  http-request add-header X-Forwarded-Proto-Version h2 if { ssl_fc_alpn -i h2 }
  http-request add-header Forwarded for=%[src];host=%[req.hdr(host)];proto=%[req.hdr(X-Forwarded-Proto)]
  cookie a84fef2b01006bb7036c768d4a819999 insert indirect nocache httponly
  server pod:web-server-rc-6dwzt:service-unsecure:http:10.42.0.13:8080 10.42.0.13:8080 cookie 654bccaf8ef4db9d1848224346d33514 weight 1
sh-5.1$  

3. rsh to a router pod of a 4.18 OCP cluster, it has the "check inter 5000ms" configuration.
% oc -n openshift-ingress rsh router-default-79597c7f5-kllkr
sh-5.1$ cat haproxy.config | grep -A7 "backend be_tcp:openshift-ingress-canary:canary"
backend be_tcp:openshift-ingress-canary:canary
  balance roundrobin


  hash-type consistent
  timeout check 5000ms
  server pod:ingress-canary-vks6b:ingress-canary:8443-tcp:10.128.2.7:8443 10.128.2.7:8443 weight 1 check inter 5000ms
  server pod:ingress-canary-6kcs4:ingress-canary:8443-tcp:10.129.2.9:8443 10.129.2.9:8443 weight 1 check inter 5000ms
  server pod:ingress-canary-4kf9v:ingress-canary:8443-tcp:10.131.0.7:8443 10.131.0.7:8443 weight 1 check inter 5000ms

    "server pod:web-server-rc-6dwzt:service-unsecure:http:10.42.0.13:8080 10.42.0.13:8080 cookie 654bccaf8ef4db9d1848224346d33514 weight 1" 

    "server pod:web-server-rc-6dwzt:service-unsecure:http:10.42.0.13:8080 10.42.0.13:8080 cookie 654bccaf8ef4db9d1848224346d33514 weight 1 check inter 5000ms"