first steps

defaults/main.yml

 ---
-# defaults file for package.net.haproxy
+package_packages:
+  - haproxy
+  - hatop
+package_services:
+  - haproxy

files/10-haproxy-global.cfg

+global
+  log /dev/log local0
+  log /dev/log local1 notice
+  chroot /var/lib/haproxy
+  stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
+  stats timeout 30s
+  user haproxy
+  group haproxy
+  daemon
+
+  ca-base /etc/ssl/certs
+  crt-base /etc/ssl/private
+
+  # See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
+  ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
+  ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
+  ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

files/20-haproxy-defaults.cfg

+defaults
+  log     global
+  mode    http
+  option  httplog
+  option  dontlognull
+  timeout connect 5000
+  timeout client  50000
+  timeout server  50000
+  # errorfile 400 /etc/haproxy/errors/400.http
+  # errorfile 403 /etc/haproxy/errors/403.http
+  # errorfile 408 /etc/haproxy/errors/408.http
+  # errorfile 500 /etc/haproxy/errors/500.http
+  # errorfile 502 /etc/haproxy/errors/502.http
+  # errorfile 503 /etc/haproxy/errors/503.http
+  # errorfile 504 /etc/haproxy/errors/504.http

tasks/configure.yml

+---
+- name: copy standard haproxy.cfg fragments
+  ansible.builtin.copy:
+    src: "{{ item }}"
+    dest: "/etc/haproxy/haproxy.cfg.d/{{ item }}"
+    owner: root
+    group: root
+    mode: 0444
+  loop:
+    - 10-haproxy-global.cfg
+    - 20-haproxy-defaults.cfg
+
+- name: assemble haproxy.cfg from fragments
+  ansible.builtin.assemble:
+    src: /etc/haproxy/haproxy.cfg.d/
+    regexp: '.*\.cfg\Z'
+    dest: /etc/haproxy/haproxy.cfg
+    owner: root
+    group: root
+    mode: 0444
+    validate: /usr/sbin/haproxy -q -c -f %s
+  notify: reload services

tasks/main.yml

 ---
-# tasks file for package.net.haproxy
+- name: call inherited tasks
+  sdm.oor.call_tasks:
+    from: main
+    super: true
+
+- name: ensure directory for haproxy.cfg fragments exists
+  ansible.builtin.file:
+    path: /etc/haproxy/haproxy.cfg.d
+    owner: root
+    group: root
+    mode: 0755
+    state: directory