Make prometheus-node-exporter a bit more capable

By running it in a more privileged container with access to the host network stack and such

roles/matrix-prometheus-node-exporter/templates/systemd/matrix-prometheus-node-exporter.service.j2

@@ -21,14 +21,17 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-prometheus-nod
 			--log-driver=none \
 			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
 			--cap-drop=ALL \
-			--network={{ matrix_docker_network }} \
 			{% if matrix_prometheus_node_exporter_container_http_host_bind_port %}
 			-p {{ matrix_prometheus_node_exporter_container_http_host_bind_port }}:9100 \
 			{% endif %}
 			{% for arg in matrix_prometheus_node_exporter_container_extra_arguments %}
 			{{ arg }} \
 			{% endfor %}
-			{{ matrix_prometheus_node_exporter_docker_image }}
+			--net="host" \
+			--pid="host" \
+			-v "/:/host:ro,rslave" \
+			{{ matrix_prometheus_node_exporter_docker_image }} \
+			--path.rootfs=/host
 
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-prometheus-node-exporter 2>/dev/null'
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-prometheus-node-exporter 2>/dev/null'

roles/matrix-prometheus/templates/prometheus.yml.j2

@@ -36,5 +36,5 @@ scrape_configs:
   {% if matrix_prometheus_node_exporter_enabled %}
   - job_name: node
     static_configs:
-      - targets: ['matrix-prometheus-node-exporter:9100']
+      - targets: ['172.18.0.1:9100']
   {% endif %}