[prometheus-node-exporter] wait for network-online.target before starting the unit

roles/prometheus-node-exporter/handlers/main.yml

@@ -3,3 +3,7 @@
   service:
     name: prometheus-node-exporter
     state: restarted
+
+- name: systemctl daemon-reload
+  systemd:
+    daemon_reload: yes

roles/prometheus-node-exporter/tasks/main.yml

@@ -27,6 +27,17 @@
       ARGS="--web.listen-address={{ prometheus_node_exporter.listen_addr }}:9100"
   tags: restart-node-exporter
 
+- name: Patch prometheus-node-exporter service
+  template:
+    src: systemd/system/prometheus-node-exporter.service.d/override.conf.j2
+    dest: /etc/systemd/system/prometheus-node-exporter.service.d/override.conf
+  register: override
+
+- name: systemctl daemon-reload
+  systemd:
+    daemon_reload: yes
+  when: override.changed
+
 - name: Activate prometheus-node-exporter service
   systemd:
     name: prometheus-node-exporter

roles/prometheus-node-exporter/templates/systemd/system/prometheus-node-exporter.service.d/override.conf.j2

@@ -0,0 +1,2 @@
+[Unit]
+After=network-online.target