r/statsd-exporter: Deploy statsd exporter

The *statsd exporter* is a Prometheus exporter that converts statistics
from StatsD format into Prometheus metrics.  It is generally useful as a
bridge between processes that emit event-based statistics, turning them
into Prometheus counters and gauges.

roles/statsd-exporter/handlers/main.yml

@@ -0,0 +1,8 @@
+- name: reload systemd
+  systemd:
+    daemon_reload: true
+
+- name: restart statsd exporter
+  service:
+    name: statsd-exporter
+    state: restarted

roles/statsd-exporter/meta/main.yml

@@ -0,0 +1,2 @@
+dependencies:
+- systemd-base

roles/statsd-exporter/tasks/main.yml

@@ -0,0 +1,66 @@
+- name: ensure required packages are installed
+  package:
+    name:
+    - podman
+    state: present
+  tags:
+  - install
+
+- name: ensure statsd-exporter os group exists
+  group:
+    name: statsd-exporter
+    gid: 228
+    system: true
+    state: present
+  tags:
+  - user
+  - group
+- name: ensure statsd-exporter os user exists
+  user:
+    name: statsd-exporter
+    uid: 228
+    system: true
+    state: present
+  tags:
+  - user
+
+- name: ensure statsd-exporter container is defined
+  template:
+    src: statsd-exporter.container.j2
+    dest: /etc/containers/systemd/statsd-exporter.container
+    owner: root
+    group: root
+    mode: u=rw,go=r
+  notify:
+  - 'statsd-exporter : reload systemd'
+  - restart statsd exporter
+  tags:
+  - systemd
+  - container
+
+- name: flush handlers
+  meta: flush_handlers
+
+- name: ensure statsd exporter starts at boot
+  service:
+    name: statsd-exporter
+    enabled: true
+  tags:
+  - service
+
+- name: ensure statsd exporter is running
+  service:
+    name: statsd-exporter
+    state: started
+  tags:
+  - service
+
+- name: ensure firewall is configured for statsd exporter
+  firewalld:
+    port: 9125/tcp
+    immediate: true
+    permanent: true
+    state: enabled
+  when: host_uses_firewalld|d(true)
+  tags:
+  - firewalld

roles/statsd-exporter/templates/statsd-exporter.container.j2

@@ -0,0 +1,16 @@
+[Unit]
+Description=StatsD Exporter for Prometheus
+Wants=network-online.target
+After=network-online.target
+
+[Container]
+Image=docker.io/prom/statsd-exporter:v0.27.1
+User=228
+Group=228
+DropCapability=all
+PublishPort=9102:9102
+PublishPort=9125:9125/tcp
+PublishPort=9125:9125/udp
+
+[Install]
+WantedBy=multi-user.target

roles/systemd-base/handlers/main.yml

@@ -0,0 +1,3 @@
+- name: reload systemd
+  systemd:
+    daemon_reload: true