service-prometheus: update config to export metrics via nginx

playbooks/prometheus/prometheus.yml.j2

@@ -23,19 +23,15 @@ scrape_configs:
     scrape_interval: 10s
     scrape_timeout:  10s
     static_configs:
-      - targets: ['localhost:9090', 'localhost:9100']
+      - targets: ['localhost:9090']
 
   - job_name: "node"
-    file_sd_configs:
-      - files:
-        - '{{ prometheus_file_sd_config_path }}/*.json'
-        - '{{ prometheus_file_sd_config_path }}/*.yml'
-        - '{{ prometheus_file_sd_config_path }}/*.yaml'
+    scheme: "https"
     static_configs:
 {%for group in prometheus_groups %}
       - targets:
 {% for host in groups[group] %}
-        - '{{ host }}:9100'
+        - '{{ host }}'
 {% endfor %}
         labels:
           group: '{{ group }}'

roles/service-nginx/templates/default.conf.j2

@@ -35,4 +35,17 @@ server {
         autoindex on;
         autoindex_exact_size off;
     }
+
+    location ^~ /metrics {
+        set $metric_addr 127.0.0.1;
+        proxy_pass http://$metric_addr:9100/metrics;
+
+        allow 127.0.0.0/8;
+        allow ::1/128;
+{% for host in groups['ffmwu-monitoring'] %}
+        allow {{ lookup('dig', host, 'qtype=A') }};
+        allow {{ lookup('dig', host, 'qtype=AAAA') }};
+        deny all;
+{% endfor %}
+    }
 }