[prometheus-nginx] Change exposed port for a non-standard port

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

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

@@ -12,7 +12,7 @@
     path: /etc/default/prometheus-nginx-exporter
     regexp: '^ARGS='
     line: |
-      ARGS="-web.listen-address={{ adm_ipv4 }}:9117"
+      ARGS="-web.listen-address={{ adm_ipv4 }}:9117 -nginx.scrape-uri=http://[::1]:6424/stub_status"
   notify:
     - Restart nginx
     - Restart prometheus-nginx-exporter

roles/prometheus-nginx-exporter/templates/nginx/status.j2

 {{ ansible_header | comment }}
 
 server {
-    listen 127.0.0.1:8080;
+    listen [::1]:8080;
     location = /stub_status {
         stub_status;
     }