1. Proposed title of this feature request
HAProxy Dynamic Configuration Manager for OpenShift 4

2. What is the nature and description of the request?
In OpenShift 3.11 the dynamic configuration manager for HAProxy was available as a feature, configurable easily setting the following env variable:

More info about this feature:
https://docs.openshift.com/container-platform/3.11/install_config/router/default_haproxy_router.html#using-the-dynamic-configuration-manager

3. Why does the customer need this? (List the business requirements here)
While seamless HAProxy reloads were included in OpenShift 3.9, one of our customers could have been detected SYN connections not being ACK'ed during the TCP handshake. This customer would like to avoid unnecessary HAProxy reloads.
This feature was available in OpenShift 3 but not in OpenShift 4.

4. List any affected packages or components.
HAProxy