feat(monitoring): add smartctl, fail2ban, wireguard exporters and dashboards

- smartctl_exporter (disks), fail2ban exporter, wireguard exporter
- grafana dashboards for each exporter
- prometheus: firewall source rules, honor_labels/params scrape config
- node_exporter: zfs collector
- wireguard: nftables dep, resolvconf wrapper, reload fix
- remove superseded monitoring role

roles/prometheus/templates/prometheus.yml.j2

@@ -36,6 +36,18 @@ scrape_configs:
 {% if scrape_config.metrics_path is defined %}
     metrics_path: {{ scrape_config.metrics_path }}
 {% endif %}
+{% if scrape_config.honor_labels is defined %}
+    honor_labels: {{ scrape_config.honor_labels | bool | lower }}
+{% endif %}
+{% if scrape_config.params is defined %}
+    params:
+{% for param_key, param_values in scrape_config.params.items() %}
+      {{ param_key }}:
+{% for param_value in param_values %}
+        - {{ param_value }}
+{% endfor %}
+{% endfor %}
+{% endif %}
 {% if scrape_config.static_configs is defined %}
     static_configs:
 {% for static_config in scrape_config.static_configs %}